diff --git a/backend/app/api/chat.py b/backend/app/api/chat.py
index 31e44e0..249fd42 100644
--- a/backend/app/api/chat.py
+++ b/backend/app/api/chat.py
@@ -1,4 +1,6 @@
-"""对话路由：会话管理 + REST 非流式对话。"""
+"""对话路由：会话管理 + 消息编辑/反馈/重新生成 + REST 非流式对话。"""
+import json
+
 from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy.orm import Session
 
@@ -6,7 +8,7 @@ from ..core.deps import get_current_user
 from ..core.response import ok
 from ..database import get_db
 from ..models import Agent, ChatMessage, ChatSession, User
-from ..schemas.chat import ChatRequest, ChatSessionCreate
+from ..schemas.chat import ChatMessageUpdate, ChatRequest, ChatSessionCreate, FeedbackRequest
 from ..services import chat_service
 
 router = APIRouter(prefix="/chat", tags=["对话"])
@@ -20,8 +22,20 @@ def _session_out(s: ChatSession) -> dict:
 
 
 def _message_out(m: ChatMessage) -> dict:
-    return {"id": m.id, "session_id": m.session_id, "role": m.role, "content": m.content,
-            "model": m.model, "created_at": m.created_at.isoformat()}
+    try:
+        suggestions = json.loads(m.suggestions) if m.suggestions else []
+    except json.JSONDecodeError:
+        suggestions = []
+    try:
+        file_ids = json.loads(m.file_ids) if m.file_ids else []
+    except json.JSONDecodeError:
+        file_ids = []
+    return {
+        "id": m.id, "session_id": m.session_id, "role": m.role, "content": m.content,
+        "model": m.model, "file_ids": file_ids, "feedback": m.feedback or "",
+        "suggestions": suggestions, "edited": bool(m.edited), "regenerated": m.regenerated or 0,
+        "created_at": m.created_at.isoformat(), "updated_at": m.updated_at.isoformat(),
+    }
 
 
 def _get_owned_session(db: Session, user: User, session_id: int) -> ChatSession:
@@ -64,16 +78,14 @@ def list_messages(session_id: int, user: User = Depends(get_current_user), db: S
 async def send_message(session_id: int, body: ChatRequest,
                        user: User = Depends(get_current_user), db: Session = Depends(get_db)):
     s = _get_owned_session(db, user, session_id)
+    if not body.content and not body.file_ids:
+        raise HTTPException(status_code=400, detail="消息内容不能为空")
     try:
-        reply = await chat_service.chat_once(db, user, s, body.content, body.agent_id, body.model)
+        reply = await chat_service.chat_once(db, user, s, body.content, body.agent_id, body.model, body.file_ids)
     except LookupError as e:
         raise HTTPException(status_code=404, detail=str(e))
     except Exception as e:
         raise HTTPException(status_code=502, detail=f"模型调用失败：{e}")
-    # 自动生成会话标题
-    if s.title == "新对话" and len(body.content) <= 40:
-        s.title = body.content[:20]
-        db.commit()
     return ok(_message_out(reply))
 
 
@@ -83,3 +95,58 @@ def delete_session(session_id: int, user: User = Depends(get_current_user), db:
     db.delete(s)
     db.commit()
     return ok(message="已删除")
+
+
+# ---------- 消息操作 ----------
+
+def _get_owned_message(db: Session, user: User, message_id: int) -> ChatMessage:
+    m = db.get(ChatMessage, message_id)
+    if not m:
+        raise HTTPException(status_code=404, detail="消息不存在")
+    s = db.get(ChatSession, m.session_id)
+    if not s or s.user_id != user.id:
+        raise HTTPException(status_code=404, detail="消息不存在")
+    return m
+
+
+@router.put("/messages/{message_id}")
+def edit_message(message_id: int, body: ChatMessageUpdate,
+                 user: User = Depends(get_current_user), db: Session = Depends(get_db)):
+    """编辑用户消息（随后前端会触发重新生成）。"""
+    m = _get_owned_message(db, user, message_id)
+    if m.role != "user":
+        raise HTTPException(status_code=400, detail="只能编辑用户消息")
+    m.content = body.content
+    m.edited = True
+    m.updated_at = __import__("datetime").datetime.utcnow()
+    db.commit()
+    db.refresh(m)
+    return ok(_message_out(m))
+
+
+@router.post("/messages/{message_id}/feedback")
+def set_feedback(message_id: int, body: FeedbackRequest,
+                 user: User = Depends(get_current_user), db: Session = Depends(get_db)):
+    m = _get_owned_message(db, user, message_id)
+    if m.role != "assistant":
+        raise HTTPException(status_code=400, detail="只能对 AI 回答反馈")
+    m.feedback = body.feedback
+    db.commit()
+    db.refresh(m)
+    return ok(_message_out(m))
+
+
+@router.post("/sessions/{session_id}/regenerate")
+async def regenerate(session_id: int,
+                     user: User = Depends(get_current_user), db: Session = Depends(get_db)):
+    """REST 非流式重新生成最后一条 AI 回答（备用，前端主要走 WS 流式）。"""
+    s = _get_owned_session(db, user, session_id)
+    try:
+        async for delta, message_id in chat_service.regenerate_stream(db, s):
+            pass  # 流式丢弃，最终内容已入库
+    except LookupError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=502, detail=f"模型调用失败：{e}")
+    m = db.get(ChatMessage, message_id)
+    return ok(_message_out(m))
diff --git a/backend/app/api/config.py b/backend/app/api/config.py
new file mode 100644
index 0000000..17bf9eb
--- /dev/null
+++ b/backend/app/api/config.py
@@ -0,0 +1,75 @@
+"""系统配置路由：
+- GET  /api/config/ui            公开 UI 配置（前端启动时拉取，无需登录）
+- GET  /api/admin/config         管理端读取配置（admin）
+- PUT  /api/admin/config         管理端保存配置（admin）
+- GET  /api/admin/stats          管理端统计（admin）
+"""
+import json
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from ..core.deps import get_current_user
+from ..core.response import ok
+from ..database import get_db
+from ..models import Agent, ChatMessage, ChatSession, Project, Task, User
+from ..services.chat_service import get_ui_config
+from ..services.default_config import DEFAULT_UI_CONFIG
+
+router = APIRouter(tags=["配置"])
+
+
+def require_admin(user: User = Depends(get_current_user)) -> User:
+    if user.role != "admin":
+        raise HTTPException(status_code=403, detail="需要管理员权限")
+    return user
+
+
+@router.get("/config/ui")
+def ui_config(db: Session = Depends(get_db)):
+    """公开：前端渲染所需的界面配置。"""
+    return ok(get_ui_config(db))
+
+
+@router.get("/admin/config")
+def get_admin_config(user: User = Depends(require_admin), db: Session = Depends(get_db)):
+    from ..models import AppConfig
+    row = db.get(AppConfig, "ui")
+    stored = {}
+    if row and row.value:
+        try:
+            stored = json.loads(row.value)
+        except json.JSONDecodeError:
+            stored = {}
+    return ok({"defaults": DEFAULT_UI_CONFIG, "stored": stored, "effective": get_ui_config(db)})
+
+
+class AdminConfigBody(BaseModel):
+    config: dict
+
+
+@router.put("/admin/config")
+def put_admin_config(body: AdminConfigBody, user: User = Depends(require_admin), db: Session = Depends(get_db)):
+    from ..models import AppConfig
+    row = db.get(AppConfig, "ui")
+    if not row:
+        row = AppConfig(key="ui", value="{}")
+        db.add(row)
+    row.value = json.dumps(body.config, ensure_ascii=False)
+    db.commit()
+    return ok(get_ui_config(db), "已保存")
+
+
+@router.get("/admin/stats")
+def admin_stats(user: User = Depends(require_admin), db: Session = Depends(get_db)):
+    return ok({
+        "users": db.query(User).count(),
+        "sessions": db.query(ChatSession).count(),
+        "messages": db.query(ChatMessage).count(),
+        "projects": db.query(Project).count(),
+        "tasks": db.query(Task).count(),
+        "agents": db.query(Agent).count(),
+        "likes": db.query(ChatMessage).filter(ChatMessage.feedback == "like").count(),
+        "dislikes": db.query(ChatMessage).filter(ChatMessage.feedback == "dislike").count(),
+    })
diff --git a/backend/app/api/files.py b/backend/app/api/files.py
index 5622789..31ea3e7 100644
--- a/backend/app/api/files.py
+++ b/backend/app/api/files.py
@@ -60,6 +60,16 @@ def _get_owned(db: Session, user: User, file_id: int) -> FileEntry:
     return f
 
 
+@router.get("/{file_id}/content")
+def file_content(file_id: int, user: User = Depends(get_current_user), db: Session = Depends(get_db)):
+    """内联内容（图片预览等，鉴权）。"""
+    f = _get_owned(db, user, file_id)
+    path = Path(f.stored_path)
+    if not path.exists():
+        raise HTTPException(status_code=404, detail="文件已丢失")
+    return FileResponse(path, media_type=f.mime or "application/octet-stream")
+
+
 @router.get("/{file_id}/download")
 def download_file(file_id: int, user: User = Depends(get_current_user), db: Session = Depends(get_db)):
     f = _get_owned(db, user, file_id)
diff --git a/backend/app/api/ws.py b/backend/app/api/ws.py
index fe8f93d..964525a 100644
--- a/backend/app/api/ws.py
+++ b/backend/app/api/ws.py
@@ -1,9 +1,14 @@
-"""WebSocket 路由：流式对话。协议：
-客户端 → {"type":"chat","content":"...","agent_id":null,"model":""}
+"""WebSocket 路由：流式对话 + 重新生成。协议：
+客户端 → {"type":"chat","content":"...","agent_id":null,"model":"","file_ids":[]}
+        {"type":"regenerate"}
 服务端 → {"type":"delta","message_id":1,"content":"增量文本"}
         {"type":"done","message_id":1}
+        {"type":"suggestions","message_id":1,"items":["..",".."]}
+        {"type":"title","title":"..."}
         {"type":"error","message":"..."}
 """
+import asyncio
+
 from fastapi import APIRouter, WebSocket, WebSocketDisconnect
 from sqlalchemy.orm import Session
 
@@ -14,6 +19,18 @@ from ..services import chat_service
 
 router = APIRouter()
 
+# session_id -> set[WebSocket]（用于推送建议/标题）
+_conns: dict[int, set[WebSocket]] = {}
+
+
+def push_to_session(session_id: int, payload: dict):
+    """向该会话的所有在线连接推送消息。"""
+    for ws in list(_conns.get(session_id, set())):
+        try:
+            asyncio.get_event_loop().create_task(ws.send_json(payload))
+        except Exception:
+            pass
+
 
 @router.websocket("/chat/ws")
 async def chat_ws(websocket: WebSocket):
@@ -40,23 +57,42 @@ async def chat_ws(websocket: WebSocket):
             await websocket.close()
             return
 
-        while True:
-            data = await websocket.receive_json()
-            if data.get("type") != "chat":
-                continue
-            content = (data.get("content") or "").strip()
-            if not content:
-                await websocket.send_json({"type": "error", "message": "消息不能为空"})
-                continue
-            try:
-                async for delta, message_id in chat_service.chat_stream(
-                    db, user, session, content,
-                    agent_id=data.get("agent_id"), model=data.get("model", ""),
-                ):
-                    await websocket.send_json({"type": "delta", "message_id": message_id, "content": delta})
-                await websocket.send_json({"type": "done", "message_id": message_id})
-            except Exception as e:
-                await websocket.send_json({"type": "error", "message": f"模型调用失败：{e}"})
+        _conns.setdefault(session.id, set()).add(websocket)
+        try:
+            while True:
+                data = await websocket.receive_json()
+                msg_type = data.get("type")
+
+                if msg_type == "chat":
+                    content = (data.get("content") or "").strip()
+                    file_ids = data.get("file_ids") or []
+                    if not content and not file_ids:
+                        await websocket.send_json({"type": "error", "message": "消息不能为空"})
+                        continue
+                    try:
+                        async for delta, message_id in chat_service.chat_stream(
+                            db, user, session, content,
+                            agent_id=data.get("agent_id"), model=data.get("model", ""),
+                            file_ids=file_ids,
+                        ):
+                            await websocket.send_json({"type": "delta", "message_id": message_id, "content": delta})
+                        await websocket.send_json({"type": "done", "message_id": message_id})
+                    except Exception as e:
+                        await websocket.send_json({"type": "error", "message": f"模型调用失败：{e}"})
+
+                elif msg_type == "regenerate":
+                    try:
+                        async for delta, message_id in chat_service.regenerate_stream(db, session):
+                            await websocket.send_json({"type": "delta", "message_id": message_id, "content": delta})
+                        await websocket.send_json({"type": "done", "message_id": message_id})
+                    except LookupError as e:
+                        await websocket.send_json({"type": "error", "message": str(e)})
+                    except Exception as e:
+                        await websocket.send_json({"type": "error", "message": f"模型调用失败：{e}"})
+        finally:
+            _conns.get(session.id, set()).discard(websocket)
+            if not _conns.get(session.id):
+                _conns.pop(session.id, None)
     except WebSocketDisconnect:
         pass
     finally:
diff --git a/backend/app/core/migrate.py b/backend/app/core/migrate.py
new file mode 100644
index 0000000..03d031c
--- /dev/null
+++ b/backend/app/core/migrate.py
@@ -0,0 +1,21 @@
+"""轻量数据库迁移：为新版本补列（SQLite/PostgreSQL 通用）。"""
+from sqlalchemy import inspect, text
+
+
+def migrate(db):
+    """检查并补齐缺失的表列。"""
+    insp = inspect(db.bind)
+    existing = {c["name"] for c in insp.get_columns("chat_messages")}
+    additions = {
+        "file_ids": "VARCHAR(256) DEFAULT '[]'",
+        "feedback": "VARCHAR(8) DEFAULT ''",
+        "suggestions": "TEXT DEFAULT '[]'",
+        "edited": "BOOLEAN DEFAULT 0",
+        "regenerated": "INTEGER DEFAULT 0",
+        "updated_at": "DATETIME",
+    }
+    for name, ddl in additions.items():
+        if name not in existing:
+            db.execute(text(f"ALTER TABLE chat_messages ADD COLUMN {name} {ddl}"))
+    if existing:
+        db.commit()
diff --git a/backend/app/main.py b/backend/app/main.py
index bfd5ae6..1418587 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -7,11 +7,12 @@ from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 
-from .api import agents, auth, chat, files, projects, tasks, ws
+from .api import agents, auth, chat, config, files, projects, tasks, ws
 from .config import settings
+from .core.migrate import migrate
 from .core.response import fail
 from .database import Base, SessionLocal, engine
-from .services.seed import seed_builtin_agents
+from .services.seed import seed_admin_user, seed_builtin_agents, seed_default_config
 
 STATIC_DIR = Path(__file__).resolve().parent.parent / "static"
 STATIC_DIR.mkdir(exist_ok=True)
@@ -23,7 +24,10 @@ async def lifespan(app: FastAPI):
     Base.metadata.create_all(bind=engine)
     db = SessionLocal()
     try:
+        migrate(db)
         seed_builtin_agents(db)
+        seed_admin_user(db)
+        seed_default_config(db)
     finally:
         db.close()
     yield
@@ -58,6 +62,7 @@ app.include_router(agents.router, prefix=settings.API_PREFIX)
 app.include_router(projects.router, prefix=settings.API_PREFIX)
 app.include_router(files.router, prefix=settings.API_PREFIX)
 app.include_router(tasks.router, prefix=settings.API_PREFIX)
+app.include_router(config.router, prefix=settings.API_PREFIX)
 app.include_router(ws.router, prefix=settings.API_PREFIX)
 
 # 静态：上传文件访问（视频抽帧 URL 等）
diff --git a/backend/app/models/__init__.py b/backend/app/models/__init__.py
index 2c54217..e306910 100644
--- a/backend/app/models/__init__.py
+++ b/backend/app/models/__init__.py
@@ -3,5 +3,6 @@ from .user import User
 from .chat import ChatSession, ChatMessage
 from .agent import Agent
 from .project import Project, ProjectTask, Task, FileEntry
+from .config import AppConfig
 
-__all__ = ["User", "ChatSession", "ChatMessage", "Agent", "Project", "ProjectTask", "Task", "FileEntry"]
+__all__ = ["User", "ChatSession", "ChatMessage", "Agent", "Project", "ProjectTask", "Task", "FileEntry", "AppConfig"]
diff --git a/backend/app/models/chat.py b/backend/app/models/chat.py
index b98aa4c..48f060b 100644
--- a/backend/app/models/chat.py
+++ b/backend/app/models/chat.py
@@ -1,7 +1,7 @@
 """对话会话与消息模型。"""
 from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from ..database import Base
@@ -33,6 +33,17 @@ class ChatMessage(Base):
     model: Mapped[str] = mapped_column(String(64), default="")
     tokens_in: Mapped[int] = mapped_column(Integer, default=0)
     tokens_out: Mapped[int] = mapped_column(Integer, default=0)
+    # 附件文件 ID 列表（JSON 数组）
+    file_ids: Mapped[str] = mapped_column(String(256), default="[]")
+    # 用户反馈：like / dislike / 空
+    feedback: Mapped[str] = mapped_column(String(8), default="")
+    # 推荐短语（JSON 数组，AI 回答后生成 1-3 条）
+    suggestions: Mapped[str] = mapped_column(Text, default="[]")
+    # 用户消息是否被编辑过
+    edited: Mapped[bool] = mapped_column(Boolean, default=False)
+    # 重新生成次数
+    regenerated: Mapped[int] = mapped_column(Integer, default=0)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
     session: Mapped["ChatSession"] = relationship(back_populates="messages")
diff --git a/backend/app/models/config.py b/backend/app/models/config.py
new file mode 100644
index 0000000..abf6a04
--- /dev/null
+++ b/backend/app/models/config.py
@@ -0,0 +1,12 @@
+"""系统配置模型：key-value（JSON 值），用于后台管理平台控制前端细节。"""
+from sqlalchemy import String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from ..database import Base
+
+
+class AppConfig(Base):
+    __tablename__ = "app_config"
+
+    key: Mapped[str] = mapped_column(String(64), primary_key=True)
+    value: Mapped[str] = mapped_column(Text, default="{}")
diff --git a/backend/app/schemas/chat.py b/backend/app/schemas/chat.py
index d43867a..5f625b4 100644
--- a/backend/app/schemas/chat.py
+++ b/backend/app/schemas/chat.py
@@ -26,7 +26,13 @@ class ChatMessageOut(BaseModel):
     role: str
     content: str
     model: str
+    file_ids: list[int] = []
+    feedback: str = ""
+    suggestions: list[str] = []
+    edited: bool = False
+    regenerated: int = 0
     created_at: str
+    updated_at: str
 
     class Config:
         from_attributes = True
@@ -34,6 +40,17 @@ class ChatMessageOut(BaseModel):
 
 class ChatRequest(BaseModel):
     """REST 非流式对话请求。"""
-    content: str = Field(min_length=1)
+    content: str = Field(default="")
     agent_id: int | None = None
     model: str = ""
+    file_ids: list[int] = []
+
+
+class ChatMessageUpdate(BaseModel):
+    """编辑用户消息。"""
+    content: str = Field(min_length=1)
+
+
+class FeedbackRequest(BaseModel):
+    """点赞/点踩。"""
+    feedback: str = Field(pattern="^(like|dislike|)$")
diff --git a/backend/app/services/chat_service.py b/backend/app/services/chat_service.py
index 6f90773..9494cfd 100644
--- a/backend/app/services/chat_service.py
+++ b/backend/app/services/chat_service.py
@@ -1,10 +1,15 @@
-"""对话服务：会话上下文组装 + LLM 流式/非流式调用。"""
+"""对话服务：上下文组装 + LLM 调用 + 附件/标题/推荐短语/重新生成。"""
+import asyncio
+import base64
+import json
 from datetime import datetime
+from pathlib import Path
 
 from sqlalchemy.orm import Session
 
 from ..core import llm
-from ..models import Agent, ChatMessage, ChatSession, User
+from ..models import Agent, ChatMessage, ChatSession, FileEntry, User
+from ..services.default_config import DEFAULT_UI_CONFIG
 
 
 def get_session(db: Session, user: User, session_id: int) -> ChatSession:
@@ -14,8 +19,58 @@ def get_session(db: Session, user: User, session_id: int) -> ChatSession:
     return session
 
 
-def build_messages(db: Session, session: ChatSession, user_content: str) -> list[dict]:
-    """组装发给 LLM 的消息：系统提示词(agent) + 最近历史 + 当前问题。"""
+def get_ui_config(db: Session) -> dict:
+    """读取 UI 配置（数据库覆盖默认值）。"""
+    from ..models import AppConfig
+    row = db.get(AppConfig, "ui")
+    if row and row.value:
+        try:
+            stored = json.loads(row.value)
+            return _deep_merge(DEFAULT_UI_CONFIG, stored)
+        except json.JSONDecodeError:
+            pass
+    return DEFAULT_UI_CONFIG
+
+
+def _deep_merge(base: dict, override: dict) -> dict:
+    out = dict(base)
+    for k, v in override.items():
+        if k in out and isinstance(out[k], dict) and isinstance(v, dict):
+            out[k] = _deep_merge(out[k], v)
+        else:
+            out[k] = v
+    return out
+
+
+def _load_attachments(db: Session, file_ids: list[int]) -> tuple[list[str], list[str]]:
+    """加载附件：返回 (图片 data URL 列表, 文本内容列表)。"""
+    images: list[str] = []
+    texts: list[str] = []
+    for fid in file_ids or []:
+        f = db.get(FileEntry, fid)
+        if not f:
+            continue
+        path = Path(f.stored_path)
+        if not path.exists():
+            continue
+        mime = f.mime or ""
+        if mime.startswith("image/"):
+            b64 = base64.b64encode(path.read_bytes()).decode()
+            images.append(f"data:{mime};base64,{b64}")
+        elif mime.startswith("text/") or f.filename.lower().endswith((".txt", ".md", ".csv", ".json", ".log", ".py", ".js", ".html", ".xml", ".yml", ".yaml")):
+            try:
+                content = path.read_text(encoding="utf-8", errors="replace")
+                texts.append(f"【附件: {f.filename}】\n{content[:20000]}")
+            except Exception:
+                texts.append(f"【附件: {f.filename}】（无法读取）")
+        else:
+            texts.append(f"【附件: {f.filename}】（不支持的类型，仅图片和文本文件可被读取）")
+    return images, texts
+
+
+def build_messages(db: Session, session: ChatSession, user_content: str,
+                   file_ids: list[int] | None = None, exclude_last: bool = False) -> list[dict]:
+    """组装发给 LLM 的消息：系统提示词(agent) + 最近历史 + 当前问题（支持图片附件）。"""
     messages: list[dict] = []
 
     if session.agent_id:
@@ -23,7 +78,6 @@ def build_messages(db: Session, session: ChatSession, user_content: str) -> list
         if agent and agent.system_prompt:
             messages.append({"role": "system", "content": agent.system_prompt})
 
-    # 最近 20 条历史（控制上下文长度）
     history = (
         db.query(ChatMessage)
         .filter(ChatMessage.session_id == session.id)
@@ -31,10 +85,25 @@ def build_messages(db: Session, session: ChatSession, user_content: str) -> list
         .limit(20)
         .all()
     )
+    # 重新生成时排除最后一条 AI 回答
+    if exclude_last and history and history[0].role == "assistant":
+        history = history[1:]
     for m in reversed(history):
         messages.append({"role": m.role, "content": m.content})
 
-    messages.append({"role": "user", "content": user_content})
+    images, texts = _load_attachments(db, file_ids or [])
+    if images:
+        content: list[dict] = []
+        if user_content:
+            content.append({"type": "text", "text": user_content})
+        for url in images:
+            content.append({"type": "image_url", "image_url": {"url": url}})
+        messages.append({"role": "user", "content": content})
+    else:
+        text = user_content
+        if texts:
+            text = (user_content + "\n\n" if user_content else "") + "\n\n".join(texts)
+        messages.append({"role": "user", "content": text})
     return messages
 
 
@@ -48,18 +117,109 @@ def resolve_model(session: ChatSession, agent: Agent | None, requested: str) ->
     return llm.settings.DEFAULT_MODEL
 
 
+def _json_files(fids: list[int]) -> str:
+    return json.dumps(fids or [])
+
+
+async def _auto_title(db: Session, session_id: int, first_content: str, reply_content: str = ""):
+    """后台任务：首个回答后自动生成会话标题（结合首轮问答内容）。"""
+    from ..database import SessionLocal
+    sdb = SessionLocal()
+    try:
+        session = sdb.get(ChatSession, session_id)
+        if not session or session.title != "新对话":
+            return
+        ui = get_ui_config(sdb)
+        if not ui.get("title_auto_gen", True):
+            return
+        model = ui.get("title_model") or "deepseek-chat"
+        user_part = first_content[:100] or "(无文字，仅图片)"
+        reply_part = (reply_content or "")[:120] or "(无回答)"
+        prompt = (
+            "根据下面这轮对话，生成一个简洁的对话标题（10 字以内，不要标点、不要引号，直接输出标题）：\n"
+            f"用户：{user_part}\n助手：{reply_part}"
+        )
+        try:
+            title = await llm.chat_completion(
+                [{"role": "user", "content": prompt}], model=model, max_tokens=30, temperature=0.3
+            )
+            title = title.strip().strip('"「」').strip().replace("\n", " ")[:30]
+            if title:
+                session.title = title
+                sdb.commit()
+                from ..api.ws import push_to_session
+                push_to_session(session_id, {"type": "title", "title": title})
+        except Exception:
+            pass
+    finally:
+        sdb.close()
+
+
+async def _gen_suggestions(db: Session, session_id: int, reply_id: int):
+    """后台任务：根据最近对话生成 1-3 条用户可能的追问短语。"""
+    from ..database import SessionLocal
+    sdb = SessionLocal()
+    try:
+        reply = sdb.get(ChatMessage, reply_id)
+        if not reply:
+            return
+        ui = get_ui_config(sdb)
+        sug_cfg = ui.get("suggestions", {})
+        if not sug_cfg.get("enabled", True):
+            return
+        count = max(1, min(3, int(sug_cfg.get("count", 3))))
+        model = sug_cfg.get("model") or "deepseek-chat"
+
+        history = (
+            sdb.query(ChatMessage)
+            .filter(ChatMessage.session_id == session_id, ChatMessage.id <= reply_id)
+            .order_by(ChatMessage.id.desc())
+            .limit(6)
+            .all()
+        )
+        transcript = "\n".join(
+            f"{'用户' if m.role == 'user' else '助手'}: {(m.content or '')[:200]}" for m in reversed(history)
+        )
+        prompt = (
+            f"以下是最近一段对话：\n{transcript}\n\n"
+            f"请以用户的视角，预测用户接下来最可能追问的 {count} 个短语（每个不超过 12 字，"
+            f"自然口语化，不要重复）。只输出 JSON 数组，如：[\"追问1\", \"追问2\"]，不要其他内容。"
+        )
+        try:
+            raw = await llm.chat_completion(
+                [{"role": "user", "content": prompt}], model=model, max_tokens=200, temperature=0.8
+            )
+            raw = raw.strip()
+            if raw.startswith("```"):
+                raw = raw.strip("`")
+                if raw.startswith("json"):
+                    raw = raw[4:]
+            items = json.loads(raw)
+            if isinstance(items, list):
+                items = [str(x)[:20] for x in items[:3]]
+                reply.suggestions = json.dumps(items, ensure_ascii=False)
+                sdb.commit()
+                from ..api.ws import push_to_session
+                push_to_session(session_id, {"type": "suggestions", "message_id": reply_id, "items": items})
+        except Exception:
+            pass
+    finally:
+        sdb.close()
+
+
 async def chat_once(db: Session, user: User, session: ChatSession, content: str,
-                    agent_id: int | None = None, model: str = "") -> ChatMessage:
+                    agent_id: int | None = None, model: str = "", file_ids: list[int] | None = None) -> ChatMessage:
     """REST 非流式：调用 LLM 并保存双方消息。"""
     if agent_id is not None:
         session.agent_id = agent_id
     agent = db.get(Agent, session.agent_id) if session.agent_id else None
     session.model = resolve_model(session, agent, model)
 
-    db.add(ChatMessage(session_id=session.id, role="user", content=content))
+    db.add(ChatMessage(session_id=session.id, role="user", content=content,
+                       file_ids=_json_files(file_ids)))
     db.commit()
 
-    messages = build_messages(db, session, content)
+    messages = build_messages(db, session, content, file_ids)
     reply_text = await llm.chat_completion(messages, model=session.model, temperature=agent.temperature if agent else 0.7)
 
     reply = ChatMessage(session_id=session.id, role="assistant", content=reply_text, model=session.model)
@@ -67,21 +227,24 @@ async def chat_once(db: Session, user: User, session: ChatSession, content: str,
     session.updated_at = datetime.utcnow()
     db.commit()
     db.refresh(reply)
+
+    _fire_background_jobs(db, session, content, reply.id, reply_text)
     return reply
 
 
 async def chat_stream(db: Session, user: User, session: ChatSession, content: str,
-                      agent_id: int | None = None, model: str = ""):
+                      agent_id: int | None = None, model: str = "", file_ids: list[int] | None = None):
     """流式：先存用户消息，逐段产出回复增量，结束后存完整回复。"""
     if agent_id is not None:
         session.agent_id = agent_id
     agent = db.get(Agent, session.agent_id) if session.agent_id else None
     session.model = resolve_model(session, agent, model)
 
-    db.add(ChatMessage(session_id=session.id, role="user", content=content))
+    db.add(ChatMessage(session_id=session.id, role="user", content=content,
+                       file_ids=_json_files(file_ids)))
     db.commit()
 
-    messages = build_messages(db, session, content)
+    messages = build_messages(db, session, content, file_ids)
     reply = ChatMessage(session_id=session.id, role="assistant", content="", model=session.model)
     db.add(reply)
     db.commit()
@@ -96,8 +259,55 @@ async def chat_stream(db: Session, user: User, session: ChatSession, content: st
             yield delta, reply.id
     except Exception as e:
         reply.content = "".join(parts) or f"（调用失败：{e}）"
+        session.updated_at = datetime.utcnow()
         db.commit()
         raise
     else:
         reply.content = "".join(parts)
+        session.updated_at = datetime.utcnow()
         db.commit()
+        _fire_background_jobs(db, session, content, reply.id, reply.content)
+
+
+def _fire_background_jobs(db: Session, session: ChatSession, first_content: str, reply_id: int, reply_content: str = ""):
+    """回答完成后：异步生成标题 + 推荐短语（各自独立会话，不阻塞请求）。"""
+    asyncio.create_task(_auto_title(db, session.id, first_content, reply_content))
+    asyncio.create_task(_gen_suggestions(db, session.id, reply_id))
+
+
+async def regenerate_stream(db: Session, session: ChatSession):
+    """重新生成最后一条 AI 回答（流式）。返回 (message_id, async_iter)。"""
+    last = (
+        db.query(ChatMessage)
+        .filter(ChatMessage.session_id == session.id, ChatMessage.role == "assistant")
+        .order_by(ChatMessage.id.desc())
+        .first()
+    )
+    if not last:
+        raise LookupError("没有可重新生成的消息")
+
+    agent = db.get(Agent, session.agent_id) if session.agent_id else None
+    messages = build_messages(db, session, "", exclude_last=True)
+
+    # 重新生成后旧建议清空，等新建议
+    last.suggestions = "[]"
+    db.commit()
+
+    parts: list[str] = []
+    try:
+        async for delta in llm.chat_completion_stream(
+            messages, model=session.model, temperature=agent.temperature if agent else 0.7
+        ):
+            parts.append(delta)
+            yield delta, last.id
+    except Exception as e:
+        last.content = "".join(parts) or f"（调用失败：{e}）"
+        last.regenerated += 1
+        db.commit()
+        raise
+    else:
+        last.content = "".join(parts)
+        last.regenerated += 1
+        session.updated_at = datetime.utcnow()
+        db.commit()
+        asyncio.create_task(_gen_suggestions(db, session.id, last.id))
diff --git a/backend/app/services/default_config.py b/backend/app/services/default_config.py
new file mode 100644
index 0000000..b5edf1d
--- /dev/null
+++ b/backend/app/services/default_config.py
@@ -0,0 +1,45 @@
+"""默认配置：后台管理平台可覆盖。
+
+chat_ui: 对话界面元素开关
+  user_edit      用户消息编辑按钮
+  user_copy      用户消息复制按钮
+  user_time      用户消息时间显示
+  user_time_fmt  时间格式（HH:mm / MM-dd HH:mm / full）
+  ai_copy        AI 回答复制按钮
+  ai_regenerate  AI 回答重新生成按钮
+  ai_feedback    AI 回答点赞/点踩按钮
+  ai_voice       AI 回答语音播放按钮
+  ai_suggestions AI 回答推荐短语
+  voice_input    语音输入按钮
+  attachment     附件上传按钮
+  attachment_types 允许的附件类型: image / text
+
+title_auto_gen: 首个回答后自动生成会话标题
+suggestions:    每次回答后生成 1-3 条推荐短语
+  enabled
+  count (1-3)
+  model  建议生成模型
+"""
+DEFAULT_UI_CONFIG = {
+    "chat_ui": {
+        "user_edit": True,
+        "user_copy": True,
+        "user_time": True,
+        "user_time_fmt": "HH:mm",
+        "ai_copy": True,
+        "ai_regenerate": True,
+        "ai_feedback": True,
+        "ai_voice": True,
+        "ai_suggestions": True,
+        "voice_input": True,
+        "attachment": True,
+        "attachment_types": ["image", "text"],
+    },
+    "title_auto_gen": True,
+    "title_model": "deepseek-chat",
+    "suggestions": {
+        "enabled": True,
+        "count": 3,
+        "model": "deepseek-chat",
+    },
+}
diff --git a/backend/app/services/seed.py b/backend/app/services/seed.py
index e846971..60a301c 100644
--- a/backend/app/services/seed.py
+++ b/backend/app/services/seed.py
@@ -1,7 +1,11 @@
-"""内置智能体初始化：系统预置 7 个角色。"""
+"""内置智能体初始化 + 初始管理员 + 默认配置。"""
+import json
+
 from sqlalchemy.orm import Session
 
-from ..models import Agent
+from ..core.security import hash_password
+from ..models import Agent, AppConfig, User
+from .default_config import DEFAULT_UI_CONFIG
 
 BUILTIN_AGENTS = [
     {
@@ -74,3 +78,24 @@ def seed_builtin_agents(db: Session):
         else:
             db.add(Agent(**item, user_id=None, is_builtin=True, is_public=True))
     db.commit()
+
+
+def seed_admin_user(db: Session):
+    """初始管理员 admin / admin123（可环境变量覆盖）。"""
+    import os
+    if not db.query(User).filter(User.username == "admin").first():
+        db.add(User(
+            username="admin",
+            email=os.environ.get("ADMIN_EMAIL", "admin@tphai.com"),
+            hashed_password=hash_password(os.environ.get("ADMIN_PASSWORD", "admin123")),
+            display_name="管理员",
+            role="admin",
+        ))
+        db.commit()
+
+
+def seed_default_config(db: Session):
+    """写入默认 UI 配置（仅首次）。"""
+    if not db.get(AppConfig, "ui"):
+        db.add(AppConfig(key="ui", value=json.dumps(DEFAULT_UI_CONFIG, ensure_ascii=False)))
+        db.commit()
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index 1f93b9c..9b2e265 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -5,6 +5,7 @@ const router = createRouter({
   history: createWebHashHistory(),
   routes: [
     { path: '/login', component: () => import('../views/LoginView.vue') },
+    { path: '/admin', component: () => import('../views/AdminView.vue') },
     {
       path: '/',
       component: () => import('../views/MainLayout.vue'),
diff --git a/frontend/src/views/AdminView.vue b/frontend/src/views/AdminView.vue
new file mode 100644
index 0000000..0adbc87
--- /dev/null
+++ b/frontend/src/views/AdminView.vue
@@ -0,0 +1,170 @@
+<template>
+  <div class="admin-page">
+    <van-nav-bar title="后台管理 · 对话界面配置" fixed placeholder left-arrow @click-left="router.push('/profile')" />
+
+    <div class="admin-body" v-if="loaded">
+      <!-- 统计 -->
+      <div class="stat-grid" v-if="stats">
+        <div v-for="s in statCards" :key="s.label" class="stat-card">
+          <div class="stat-num">{{ stats[s.key] ?? 0 }}</div>
+          <div class="stat-label">{{ s.label }}</div>
+        </div>
+      </div>
+
+      <!-- 对话界面开关 -->
+      <van-cell-group inset title="① 对话界面元素开关">
+        <van-cell v-for="s in uiSwitches" :key="s.key" :title="s.label" :label="s.desc">
+          <template #right-icon>
+            <van-switch v-model="cfg.chat_ui[s.key]" size="22" />
+          </template>
+        </van-cell>
+      </van-cell-group>
+
+      <!-- 时间格式 -->
+      <van-cell-group inset title="② 用户消息时间格式">
+        <van-cell title="时间格式">
+          <template #value>
+            <van-radio-group v-model="cfg.chat_ui.user_time_fmt" direction="horizontal">
+              <van-radio name="HH:mm">HH:mm</van-radio>
+              <van-radio name="MM-dd HH:mm">MM-dd HH:mm</van-radio>
+              <van-radio name="full">完整时间</van-radio>
+            </van-radio-group>
+          </template>
+        </van-cell>
+      </van-cell-group>
+
+      <!-- 附件类型 -->
+      <van-cell-group inset title="③ 允许的附件类型">
+        <van-cell title="上传类型（图片 / 可读文本）">
+          <template #value>
+            <van-checkbox-group v-model="cfg.chat_ui.attachment_types" direction="horizontal">
+              <van-checkbox name="image">图片</van-checkbox>
+              <van-checkbox name="text">文本文件</van-checkbox>
+            </van-checkbox-group>
+          </template>
+        </van-cell>
+      </van-cell-group>
+
+      <!-- 自动标题 -->
+      <van-cell-group inset title="④ 自动生成会话标题（首个回答后）">
+        <van-cell title="启用自动标题">
+          <template #right-icon>
+            <van-switch v-model="cfg.title_auto_gen" size="22" />
+          </template>
+        </van-cell>
+        <van-field v-model="cfg.title_model" label="标题模型" placeholder="deepseek-chat" />
+      </van-cell-group>
+
+      <!-- 推荐短语 -->
+      <van-cell-group inset title="⑤ 推荐短语（每次回答后生成 1-3 条）">
+        <van-cell title="启用推荐短语">
+          <template #right-icon>
+            <van-switch v-model="cfg.suggestions.enabled" size="22" />
+          </template>
+        </van-cell>
+        <van-cell title="生成数量">
+          <template #value>
+            <van-stepper v-model="cfg.suggestions.count" :min="1" :max="3" />
+          </template>
+        </van-cell>
+        <van-field v-model="cfg.suggestions.model" label="建议模型" placeholder="deepseek-chat" />
+      </van-cell-group>
+
+      <div style="padding: 20px 16px; display: flex; gap: 12px">
+        <van-button block plain type="primary" @click="reset">恢复默认</van-button>
+        <van-button block type="primary" :loading="saving" @click="save">保存配置</van-button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted, ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { showToast } from 'vant'
+import client from '../api/client'
+import { useAuthStore } from '../stores/auth'
+
+const router = useRouter()
+const auth = useAuthStore()
+const loaded = ref(false)
+const saving = ref(false)
+const cfg = ref<any>({ chat_ui: {}, title_auto_gen: true, title_model: 'deepseek-chat', suggestions: { enabled: true, count: 3, model: 'deepseek-chat' } })
+const stats = ref<any>(null)
+
+const uiSwitches = [
+  { key: 'user_edit', label: '用户消息 · 编辑按钮', desc: '点击可修改消息并重新生成回答' },
+  { key: 'user_copy', label: '用户消息 · 复制按钮' },
+  { key: 'user_time', label: '用户消息 · 提交时间', desc: '在编辑/复制按钮旁显示' },
+  { key: 'ai_copy', label: 'AI 回答 · 复制按钮' },
+  { key: 'ai_regenerate', label: 'AI 回答 · 重新生成按钮' },
+  { key: 'ai_feedback', label: 'AI 回答 · 点赞/点踩' },
+  { key: 'ai_voice', label: 'AI 回答 · 语音播放', desc: '浏览器 TTS 朗读' },
+  { key: 'ai_suggestions', label: 'AI 回答 · 推荐短语', desc: '回答下方显示 1-3 条追问建议' },
+  { key: 'voice_input', label: '输入区 · 语音输入按钮', desc: '浏览器语音识别（Chrome/Edge）' },
+  { key: 'attachment', label: '输入区 · 附件上传按钮', desc: '支持图片和可读文本文件' },
+]
+
+const statCards = [
+  { key: 'users', label: '用户' },
+  { key: 'sessions', label: '会话' },
+  { key: 'messages', label: '消息' },
+  { key: 'projects', label: '项目' },
+  { key: 'agents', label: '智能体' },
+  { key: 'likes', label: '点赞' },
+  { key: 'dislikes', label: '点踩' },
+]
+
+onMounted(async () => {
+  if (auth.user?.role !== 'admin') {
+    showToast('需要管理员权限')
+    router.replace('/profile')
+    return
+  }
+  try {
+    const data = await client.get('/admin/config')
+    // 用 effective（含默认值）作为编辑底稿，保证结构完整
+    const eff = JSON.parse(JSON.stringify(data.effective))
+    cfg.value = eff
+    stats.value = await client.get('/admin/stats')
+    loaded.value = true
+  } catch (e: any) {
+    showToast(e.message)
+  }
+})
+
+async function save() {
+  saving.value = true
+  try {
+    await client.put('/admin/config', { config: cfg.value })
+    showToast('已保存，前端下次加载生效')
+  } catch (e: any) {
+    showToast(e.message)
+  } finally {
+    saving.value = false
+  }
+}
+
+async function reset() {
+  cfg.value = {
+    chat_ui: {
+      user_edit: true, user_copy: true, user_time: true, user_time_fmt: 'HH:mm',
+      ai_copy: true, ai_regenerate: true, ai_feedback: true, ai_voice: true, ai_suggestions: true,
+      voice_input: true, attachment: true, attachment_types: ['image', 'text'],
+    },
+    title_auto_gen: true,
+    title_model: 'deepseek-chat',
+    suggestions: { enabled: true, count: 3, model: 'deepseek-chat' },
+  }
+  showToast('已恢复默认，请点击保存生效')
+}
+</script>
+
+<style scoped>
+.admin-page { min-height: 100vh; background: #f7f8fa; }
+.admin-body { max-width: 860px; margin: 0 auto; padding-bottom: 40px; }
+.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; padding: 12px 16px; }
+.stat-card { background: #fff; border-radius: 10px; padding: 12px; text-align: center; box-shadow: 0 1px 4px rgba(0,0,0,.05); }
+.stat-num { font-size: 22px; font-weight: 700; color: #1989fa; }
+.stat-label { font-size: 12px; color: #969799; margin-top: 2px; }
+</style>
diff --git a/frontend/src/views/ChatRoomView.vue b/frontend/src/views/ChatRoomView.vue
index 41200c9..b4ceabe 100644
--- a/frontend/src/views/ChatRoomView.vue
+++ b/frontend/src/views/ChatRoomView.vue
@@ -10,39 +10,94 @@
       <van-empty v-if="messages.length === 0" description="发送第一条消息开始对话" />
       <div v-for="m in messages" :key="m.id" :class="['msg-row', m.role === 'user' ? 'msg-user' : 'msg-ai']">
         <div v-if="m.role !== 'user'" class="msg-avatar">🤖</div>
-        <div class="bubble">
-          <div v-if="m.role === 'user'" class="plain-text">{{ m.content }}</div>
-          <div v-else class="markdown-body" v-html="renderMd(m.content)"></div>
-          <div v-if="m.role === 'assistant' && m.id === streamingId" class="typing">
-            <van-loading size="14" /> 正在思考…
-          </div>
+
+        <div class="msg-body">
+          <!-- 用户消息 -->
+          <template v-if="m.role === 'user'">
+            <div class="bubble">
+              <div class="plain-text">{{ m.content }}</div>
+              <!-- 附件图片 -->
+              <div v-if="m.file_ids?.length" class="attach-preview">
+                <img v-for="id in m.file_ids" :key="id" v-if="imgUrlFor(id)" :src="imgUrlFor(id)" class="attach-img" @click="previewImg(imgUrlFor(id))" />
+              </div>
+              <div v-if="m.edited" class="edited-tag">已编辑</div>
+            </div>
+            <div v-if="ui.chat_ui?.user_edit || ui.chat_ui?.user_copy || ui.chat_ui?.user_time" class="msg-tools user-tools">
+              <van-icon v-if="ui.chat_ui?.user_edit" name="edit" @click="startEdit(m)" />
+              <van-icon v-if="ui.chat_ui?.user_copy" name="copy" @click="copyText(m.content)" />
+              <span v-if="ui.chat_ui?.user_time" class="msg-time">{{ fmtTime(m.created_at) }}</span>
+            </div>
+          </template>
+
+          <!-- AI 回答 -->
+          <template v-else>
+            <div class="bubble">
+              <div class="markdown-body" v-html="renderMd(m.content)"></div>
+              <div v-if="m.id === streamingId" class="typing">
+                <van-loading size="14" /> 正在思考…
+              </div>
+              <!-- 推荐短语 -->
+              <div v-if="ui.chat_ui?.ai_suggestions && m.suggestions?.length && m.id !== streamingId" class="sugg-chips">
+                <div v-for="s in m.suggestions" :key="s" class="sugg-chip" @click="quickSend(s)">{{ s }}</div>
+              </div>
+            </div>
+            <div v-if="hasAiTools" class="msg-tools ai-tools">
+              <van-icon v-if="ui.chat_ui?.ai_copy" name="copy" @click="copyText(m.content)" />
+              <van-icon v-if="ui.chat_ui?.ai_regenerate" name="replay" @click="regenerate()" />
+              <van-icon v-if="ui.chat_ui?.ai_feedback" name="good-job" :class="{ active: m.feedback === 'like' }" @click="feedback(m, 'like')" />
+              <van-icon v-if="ui.chat_ui?.ai_feedback" name="bad-job" :class="{ active: m.feedback === 'dislike' }" @click="feedback(m, 'dislike')" />
+              <van-icon v-if="ui.chat_ui?.ai_voice" :name="speakingId === m.id ? 'volume-o' : 'volume'" @click="speak(m)" />
+            </div>
+          </template>
         </div>
       </div>
     </div>
 
-    <div class="input-bar" style="max-width: 860px; margin: 0 auto">
-      <van-field
-        v-model="input"
-        type="textarea"
-        autosize
-        rows="1"
-        maxlength="4000"
-        placeholder="输入消息…"
-        @keydown.enter.exact.prevent="send"
-      />
-      <van-button type="primary" :disabled="sending || !input.trim()" @click="send">发送</van-button>
+    <!-- 输入区 -->
+    <div class="input-bar">
+      <div class="input-row">
+        <van-icon v-if="ui.chat_ui?.voice_input" name="audio" size="22" class="input-icon" @click="startVoice" />
+        <van-icon v-if="ui.chat_ui?.attachment" name="plus" size="22" class="input-icon" @click="showAttachSheet = true" />
+        <van-field
+          v-model="input"
+          type="textarea"
+          autosize
+          rows="1"
+          maxlength="4000"
+          :placeholder="editingMsg ? '编辑消息…（保存后自动重新生成回答）' : '输入消息…'"
+          @keydown.enter.exact.prevent="send"
+        />
+        <van-button type="primary" :disabled="sending || (!input.trim() && attachments.length === 0)" @click="send">
+          {{ editingMsg ? '更新' : '发送' }}
+        </van-button>
+      </div>
+      <!-- 已选附件 -->
+      <div v-if="attachments.length" class="attach-list">
+        <div v-for="(a, i) in attachments" :key="i" class="attach-item">
+          <img v-if="a.type === 'image'" :src="a.preview" class="attach-thumb" />
+          <van-icon v-else name="description" size="22" color="#1989fa" />
+          <span class="attach-name">{{ a.name }}</span>
+          <van-icon name="cross" class="attach-del" @click="attachments.splice(i, 1)" />
+        </div>
+      </div>
     </div>
+
+    <!-- 附件类型选择 -->
+    <van-action-sheet v-model:show="showAttachSheet" :actions="attachActions" cancel-text="取消" @select="onAttachSelect" />
+
+    <!-- 图片预览 -->
+    <van-image-preview v-model:show="showPreview" :images="previewList" :start-position="previewIndex" />
   </div>
 </template>
 
 <script setup lang="ts">
 import { computed, nextTick, onBeforeUnmount, onMounted, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { showConfirmDialog, showToast } from 'vant'
+import { showConfirmDialog, showImagePreview, showToast } from 'vant'
 import { marked } from 'marked'
 import hljs from 'highlight.js'
 import 'highlight.js/styles/github.css'
-import client, { wsUrl } from '../api/client'
+import client, { API_BASE, wsUrl } from '../api/client'
 
 marked.setOptions({
   highlight(code: string, lang: string) {
@@ -61,13 +116,70 @@ const input = ref('')
 const sending = ref(false)
 const streamingId = ref<number | null>(null)
 const scrollRef = ref<HTMLElement>()
+const ui = ref<any>({ chat_ui: {} })
+const attachments = ref<any[]>([])
+const showAttachSheet = ref(false)
+const editingMsg = ref<any>(null)
+const speakingId = ref<number | null>(null)
+const showPreview = ref(false)
+const previewList = ref<string[]>([])
+const previewIndex = ref(0)
+
+// 附件图片缓存：file_id -> objectURL
+const imgCache = new Map<number, string>()
+
+function imgUrlFor(id: number): string {
+  return imgCache.get(id) || ''
+}
+
+async function scanImages() {
+  const ids = new Set<number>()
+  messages.value.forEach((m: any) => (m.file_ids || []).forEach((id: number) => ids.add(id)))
+  for (const id of ids) {
+    if (imgCache.has(id)) continue
+    try {
+      const resp = await fetch(`${API_BASE}/files/${id}/content`, {
+        headers: { Authorization: `Bearer ${localStorage.getItem('token')}` },
+      })
+      if (!resp.ok) continue
+      const blob = await resp.blob()
+      if (blob.type.startsWith('image/')) {
+        imgCache.set(id, URL.createObjectURL(blob))
+      }
+    } catch {}
+  }
+}
 
 let ws: WebSocket | null = null
+let titleTimer: number | null = null
+let suggTimer: number | null = null
+
+const hasAiTools = computed(() => {
+  const c = ui.value.chat_ui || {}
+  return c.ai_copy || c.ai_regenerate || c.ai_feedback || c.ai_voice
+})
+
+const attachActions = computed(() => {
+  const types = ui.value.chat_ui?.attachment_types || ['image', 'text']
+  const actions: any[] = []
+  if (types.includes('image')) actions.push({ name: '上传图片', subname: 'JPG/PNG/GIF/WebP', value: 'image' })
+  if (types.includes('text')) actions.push({ name: '上传文本文件', subname: 'TXT/MD/CSV/JSON/代码文件', value: 'text' })
+  return actions
+})
 
 function renderMd(text: string) {
   return marked.parse(text || '')
 }
 
+function fmtTime(iso: string) {
+  const d = new Date(iso)
+  const fmt = ui.value.chat_ui?.user_time_fmt || 'HH:mm'
+  const p = (n: number) => String(n).padStart(2, '0')
+  if (fmt === 'full') return `${d.getFullYear()}-${p(d.getMonth() + 1)}-${p(d.getDate())} ${p(d.getHours())}:${p(d.getMinutes())}`
+  if (fmt === 'MM-dd HH:mm') return `${p(d.getMonth() + 1)}-${p(d.getDate())} ${p(d.getHours())}:${p(d.getMinutes())}`
+  return `${p(d.getHours())}:${p(d.getMinutes())}`
+}
+
 function scrollBottom() {
   nextTick(() => {
     const el = scrollRef.value
@@ -76,6 +188,9 @@ function scrollBottom() {
 }
 
 async function load() {
+  try {
+    ui.value = await client.get('/config/ui')
+  } catch {}
   try {
     const sessions = await client.get('/chat/sessions')
     session.value = sessions.find((s: any) => s.id === sessionId.value) || null
@@ -86,15 +201,27 @@ async function load() {
   }
 }
 
+// ---------- 发送 ----------
 function send() {
   const content = input.value.trim()
-  if (!content || sending.value) return
+  if (sending.value) return
+  if (!content && attachments.value.length === 0) return
+
+  if (editingMsg.value) {
+    // 编辑：更新消息内容，然后重新生成
+    saveEdit(content)
+    return
+  }
+
   input.value = ''
   sending.value = true
 
+  const fileIds = attachments.value.map((a) => a.fileId)
+  attachments.value = []
+
   const tempId = -Date.now()
-  messages.value.push({ id: tempId, role: 'user', content })
-  const aiMsg = { id: -Date.now() - 1, role: 'assistant', content: '' }
+  messages.value.push({ id: tempId, role: 'user', content, file_ids: fileIds })
+  const aiMsg = { id: -Date.now() - 1, role: 'assistant', content: '', suggestions: [] }
   messages.value.push(aiMsg)
   streamingId.value = aiMsg.id
   scrollBottom()
@@ -102,7 +229,7 @@ function send() {
   if (!ws || ws.readyState !== WebSocket.OPEN) {
     ws = new WebSocket(wsUrl(sessionId.value))
     ws.onmessage = (ev) => handleWs(ev, aiMsg)
-    ws.onopen = () => ws!.send(JSON.stringify({ type: 'chat', content }))
+    ws.onopen = () => ws!.send(JSON.stringify({ type: 'chat', content, file_ids: fileIds }))
     ws.onerror = () => {
       showToast('连接失败，请重试')
       sending.value = false
@@ -110,7 +237,43 @@ function send() {
     }
     ws.onclose = () => { ws = null }
   } else {
-    ws.send(JSON.stringify({ type: 'chat', content }))
+    ws.send(JSON.stringify({ type: 'chat', content, file_ids: fileIds }))
+  }
+}
+
+async function saveEdit(content: string) {
+  const target = editingMsg.value
+  sending.value = true
+  try {
+    await client.put(`/chat/messages/${target.id}`, { content })
+    // 本地更新
+    const msg = messages.value.find((m) => m.id === target.id)
+    if (msg) { msg.content = content; msg.edited = true }
+    // 触发重新生成
+    regenerate()
+  } catch (e: any) {
+    showToast(e.message)
+    sending.value = false
+  }
+}
+
+function regenerate() {
+  const aiMsg = { id: -Date.now() - 2, role: 'assistant', content: '', suggestions: [] }
+  messages.value.push(aiMsg)
+  streamingId.value = aiMsg.id
+  sending.value = true
+  editingMsg.value = null
+  scrollBottom()
+
+  const doSend = () => ws!.send(JSON.stringify({ type: 'regenerate' }))
+  if (!ws || ws.readyState !== WebSocket.OPEN) {
+    ws = new WebSocket(wsUrl(sessionId.value))
+    ws.onmessage = (ev) => handleWs(ev, aiMsg)
+    ws.onopen = doSend
+    ws.onerror = () => { showToast('连接失败'); sending.value = false; streamingId.value = null }
+    ws.onclose = () => { ws = null }
+  } else {
+    doSend()
   }
 }
 
@@ -122,11 +285,13 @@ function handleWs(ev: MessageEvent, aiMsg: any) {
   } else if (data.type === 'done') {
     streamingId.value = null
     sending.value = false
-    // 刷新消息列表拿到真实 id
-    client.get(`/chat/sessions/${sessionId.value}/messages`).then((ms) => {
-      messages.value = ms
-      scrollBottom()
-    })
+    refreshMessages()
+    scheduleSuggestRefresh()
+  } else if (data.type === 'suggestions') {
+    const msg = messages.value.find((m) => m.id === data.message_id)
+    if (msg) msg.suggestions = data.items
+  } else if (data.type === 'title') {
+    if (session.value) session.value.title = data.title
   } else if (data.type === 'error') {
     aiMsg.content = `⚠️ ${data.message}`
     streamingId.value = null
@@ -135,6 +300,135 @@ function handleWs(ev: MessageEvent, aiMsg: any) {
   }
 }
 
+async function refreshMessages() {
+  try {
+    messages.value = await client.get(`/chat/sessions/${sessionId.value}/messages`)
+    const sessions = await client.get('/chat/sessions')
+    session.value = sessions.find((s: any) => s.id === sessionId.value) || session.value
+    scanImages()
+    scrollBottom()
+  } catch {}
+}
+
+function scheduleSuggestRefresh() {
+  // 建议异步生成，稍后刷新一次
+  if (suggTimer) window.clearTimeout(suggTimer)
+  suggTimer = window.setTimeout(refreshMessages, 4000)
+  titleTimer = window.setTimeout(async () => {
+    try {
+      const sessions = await client.get('/chat/sessions')
+      session.value = sessions.find((s: any) => s.id === sessionId.value) || session.value
+    } catch {}
+  }, 6000)
+}
+
+// ---------- 消息操作 ----------
+function startEdit(m: any) {
+  editingMsg.value = m
+  input.value = m.content
+  scrollBottom()
+}
+
+function copyText(text: string) {
+  navigator.clipboard?.writeText(text || '').then(
+    () => showToast('已复制'),
+    () => showToast('复制失败')
+  )
+}
+
+async function feedback(m: any, kind: string) {
+  const next = m.feedback === kind ? '' : kind
+  m.feedback = next
+  try {
+    await client.post(`/chat/messages/${m.id}/feedback`, { feedback: next })
+  } catch {
+    showToast('操作失败')
+  }
+}
+
+// 语音播放（浏览器 TTS）
+function speak(m: any) {
+  if (!('speechSynthesis' in window)) return showToast('当前浏览器不支持语音播放')
+  if (speakingId.value === m.id) {
+    window.speechSynthesis.cancel()
+    speakingId.value = null
+    return
+  }
+  window.speechSynthesis.cancel()
+  const text = (m.content || '').replace(/[#*`>|~\-\[\]()]/g, ' ').slice(0, 2000)
+  const u = new SpeechSynthesisUtterance(text)
+  u.lang = 'zh-CN'
+  u.rate = 1
+  u.onend = () => { speakingId.value = null }
+  u.onerror = () => { speakingId.value = null }
+  speakingId.value = m.id
+  window.speechSynthesis.speak(u)
+}
+
+// 语音输入
+function startVoice() {
+  const SR: any = (window as any).SpeechRecognition || (window as any).webkitSpeechRecognition
+  if (!SR) return showToast('当前浏览器不支持语音输入（建议用 Chrome/Edge）')
+  const rec = new SR()
+  rec.lang = 'zh-CN'
+  rec.interimResults = true
+  rec.continuous = true
+  rec.onresult = (e: any) => {
+    let text = ''
+    for (let i = 0; i < e.results.length; i++) text += e.results[i][0].transcript
+    input.value = text
+  }
+  rec.onend = () => showToast('语音输入结束')
+  rec.onerror = (e: any) => showToast(`语音识别失败：${e.error || ''}`)
+  showToast('请说话…')
+  rec.start()
+}
+
+// ---------- 附件 ----------
+function onAttachSelect(action: any) {
+  showAttachSheet.value = false
+  const isImage = action.value === 'image'
+  const fileInput = document.createElement('input')
+  fileInput.type = 'file'
+  fileInput.accept = isImage ? 'image/*' : '.txt,.md,.csv,.json,.log,.py,.js,.ts,.html,.css,.xml,.yml,.yaml,.sh'
+  fileInput.onchange = async () => {
+    const file = fileInput.files?.[0]
+    if (!file) return
+    if (file.size > 20 * 1024 * 1024) return showToast('文件不能超过 20MB')
+    const preview = isImage ? URL.createObjectURL(file) : ''
+    // 先展示，再上传
+    const item = { name: file.name, type: isImage ? 'image' : 'text', preview, fileId: 0, uploading: true }
+    attachments.value.push(item)
+    try {
+      const fd = new FormData()
+      fd.append('file', file)
+      const f = await client.post('/files/upload', fd, { headers: { 'Content-Type': 'multipart/form-data' } })
+      item.fileId = f.id
+      item.uploading = false
+    } catch (e: any) {
+      showToast(`上传失败：${e.message}`)
+      attachments.value = attachments.value.filter((a) => a !== item)
+    }
+  }
+  fileInput.click()
+}
+
+function imageUrls(m: any) {
+  return (m.file_ids || []).map((id: number) => ({ id, url: '' })).filter(() => false)
+}
+
+async function previewImg(url: string) {
+  showImagePreview([url])
+}
+
+onMounted(load)
+onBeforeUnmount(() => {
+  ws?.close()
+  if (suggTimer) window.clearTimeout(suggTimer)
+  if (titleTimer) window.clearTimeout(titleTimer)
+  window.speechSynthesis?.cancel()
+})
+
 async function delSession() {
   try {
     await showConfirmDialog({ title: '删除会话', message: '确定删除该会话及全部消息？' })
@@ -142,23 +436,39 @@ async function delSession() {
     router.replace('/chat')
   } catch {}
 }
-
-onMounted(load)
-onBeforeUnmount(() => ws?.close())
 </script>
 
 <style scoped>
 .chat-room { display: flex; flex-direction: column; height: 100vh; max-width: 860px; margin: 0 auto; background: #f7f8fa; }
 .msg-list { flex: 1; overflow-y: auto; padding: 12px 14px 8px; }
-.msg-row { display: flex; margin-bottom: 12px; }
+.msg-row { display: flex; margin-bottom: 14px; }
 .msg-user { justify-content: flex-end; }
 .msg-ai { justify-content: flex-start; align-items: flex-start; }
 .msg-avatar { width: 34px; height: 34px; border-radius: 50%; background: #e8f3ff; display: flex; align-items: center; justify-content: center; font-size: 18px; margin-right: 8px; flex-shrink: 0; }
-.bubble { max-width: 82%; padding: 9px 12px; border-radius: 10px; font-size: 14px; line-height: 1.65; }
+.msg-body { max-width: 82%; display: flex; flex-direction: column; }
+.msg-user .msg-body { align-items: flex-end; }
+.bubble { padding: 9px 12px; border-radius: 10px; font-size: 14px; line-height: 1.65; word-break: break-word; }
 .msg-user .bubble { background: #1989fa; color: #fff; border-top-right-radius: 2px; }
-.msg-ai .bubble { background: #fff; border: 1px solid #ebedf0; border-top-left-radius: 2px; }
-.plain-text { white-space: pre-wrap; word-break: break-word; }
+.msg-ai .bubble { background: #fff; border: 1px solid #ebedf0; border-top-left-radius: 2px; width: fit-content; }
+.plain-text { white-space: pre-wrap; }
+.edited-tag { font-size: 10px; opacity: .7; margin-top: 4px; text-align: right; }
+.msg-tools { display: flex; align-items: center; gap: 14px; margin-top: 4px; color: #969799; font-size: 15px; padding: 0 4px; }
+.user-tools { justify-content: flex-end; }
+.msg-tools .van-icon { cursor: pointer; }
+.msg-tools .van-icon.active { color: #1989fa; }
+.msg-time { font-size: 11px; color: #c8c9cc; }
 .typing { display: flex; align-items: center; gap: 6px; color: #969799; font-size: 12px; margin-top: 4px; }
-.input-bar { display: flex; align-items: flex-end; gap: 8px; padding: 8px 12px calc(12px + env(safe-area-inset-bottom)); background: #fff; border-top: 1px solid #ebedf0; }
-.input-bar .van-field { flex: 1; background: #f7f8fa; border-radius: 8px; padding: 4px 10px; }
+.sugg-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
+.sugg-chip { background: #e8f3ff; color: #1989fa; font-size: 12px; padding: 4px 10px; border-radius: 14px; cursor: pointer; }
+.attach-preview { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
+.attach-img { width: 120px; height: 90px; object-fit: cover; border-radius: 6px; }
+.input-bar { border-top: 1px solid #ebedf0; background: #fff; padding: 6px 10px calc(8px + env(safe-area-inset-bottom)); }
+.input-row { display: flex; align-items: flex-end; gap: 8px; max-width: 860px; margin: 0 auto; }
+.input-icon { color: #646566; flex-shrink: 0; margin-bottom: 8px; }
+.input-row .van-field { flex: 1; background: #f7f8fa; border-radius: 8px; padding: 4px 10px; }
+.attach-list { display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 4px 0; max-width: 860px; margin: 0 auto; }
+.attach-item { display: flex; align-items: center; gap: 6px; background: #f7f8fa; border-radius: 8px; padding: 4px 8px; font-size: 12px; position: relative; }
+.attach-thumb { width: 32px; height: 32px; object-fit: cover; border-radius: 6px; }
+.attach-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.attach-del { color: #969799; }
 </style>
diff --git a/frontend/src/views/ProfileView.vue b/frontend/src/views/ProfileView.vue
index 8e4035c..bc0937d 100644
--- a/frontend/src/views/ProfileView.vue
+++ b/frontend/src/views/ProfileView.vue
@@ -20,6 +20,7 @@
     </van-cell-group>
 
     <van-cell-group inset style="margin-top: 12px">
+      <van-cell v-if="user?.role === 'admin'" title="⚙️ 后台管理" label="对话界面配置" is-link to="/admin" />
       <van-cell title="关于随身助手" is-link @click="showAbout = true" />
       <van-cell title="退出登录" is-link @click="logout" />
     </van-cell-group>