feat: 后台管理系统 (Python Flask)

后台管理功能： - 大模型接口配置管理（增删改、设为默认） - 智能体管理（增删改、类别、标签、prompt、LLM配置、热度等） - 搜索配置管理（Tavily等搜索接口） - 系统设置（应用名称、版本、游客限制、管理员密码） - 统计信息（LLM调用、搜索调用、智能体使用排行）技术方案： - Python Flask 后端服务 (端口 19020) - SQLite 数据库存储配置 - 前端后台管理界面 (/admin) - RESTful API 接口后台入口： - URL: http://localhost:19020/admin - 默认账号: admin / admin123 前端配置获取： - /api/config 获取LLM、搜索、智能体、系统配置
2026-04-27 12:34:01 +08:00
parent f24cefb2ab
commit 3411de1612
6 changed files with 1965 additions and 0 deletions
--- a/backend/app.py
+++ b/backend/app.py
@@ -0,0 +1,611 @@
+#!/usr/bin/env python3
+"""
+AI Chat App - 后台管理服务
+端口: 19020 (与前端同一端口)
+"""
+
+from flask import Flask, jsonify, request, send_from_directory
+from flask_cors import CORS
+import os
+import json
+import sqlite3
+from datetime import datetime
+import hashlib
+
+app = Flask(__name__, static_folder='../www')
+CORS(app)
+
+# 数据库路径
+DB_PATH = os.path.join(os.path.dirname(__file__), 'data.db')
+
+# 管理员账户（默认）
+ADMIN_USERNAME = 'admin'
+ADMIN_PASSWORD_HASH = hashlib.sha256('admin123'.encode()).hexdigest()
+
+
+def get_db():
+    """获取数据库连接"""
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    return conn
+
+
+def init_db():
+    """初始化数据库"""
+    conn = get_db()
+    cursor = conn.cursor()
+    
+    # 大模型接口配置表
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS llm_configs (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            name TEXT NOT NULL,
+            provider TEXT NOT NULL,
+            api_url TEXT NOT NULL,
+            api_key TEXT NOT NULL,
+            model TEXT NOT NULL,
+            max_tokens INTEGER DEFAULT 2048,
+            temperature REAL DEFAULT 0.7,
+            is_default INTEGER DEFAULT 0,
+            is_active INTEGER DEFAULT 1,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    ''')
+    
+    # 智能体配置表
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS agents (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            agent_id TEXT NOT NULL UNIQUE,
+            name TEXT NOT NULL,
+            avatar TEXT DEFAULT '🤖',
+            category TEXT NOT NULL,
+            description TEXT,
+            system_prompt TEXT NOT NULL,
+            llm_config_id INTEGER,
+            temperature REAL DEFAULT 0.7,
+            max_tokens INTEGER DEFAULT 2048,
+            enable_search INTEGER DEFAULT 0,
+            tags TEXT,
+            heat INTEGER DEFAULT 0,
+            is_active INTEGER DEFAULT 1,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (llm_config_id) REFERENCES llm_configs(id)
+        )
+    ''')
+    
+    # 搜索配置表
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS search_configs (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            name TEXT NOT NULL,
+            provider TEXT NOT NULL,
+            api_url TEXT NOT NULL,
+            api_key TEXT NOT NULL,
+            max_results INTEGER DEFAULT 10,
+            is_default INTEGER DEFAULT 0,
+            is_active INTEGER DEFAULT 1,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    ''')
+    
+    # 系统配置表
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS system_configs (
+            key TEXT PRIMARY KEY,
+            value TEXT,
+            description TEXT,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    ''')
+    
+    # 统计日志表
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS stats_logs (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            log_type TEXT NOT NULL,
+            log_key TEXT NOT NULL,
+            log_value INTEGER DEFAULT 1,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    ''')
+    
+    # 用户表（后台管理）
+    cursor.execute('''
+        CREATE TABLE IF NOT EXISTS admin_users (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            username TEXT NOT NULL UNIQUE,
+            password_hash TEXT NOT NULL,
+            role TEXT DEFAULT 'admin',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    ''')
+    
+    # 初始化默认大模型配置
+    cursor.execute('SELECT COUNT(*) FROM llm_configs')
+    if cursor.fetchone()[0] == 0:
+        cursor.execute('''
+            INSERT INTO llm_configs (name, provider, api_url, api_key, model, is_default)
+            VALUES ('智谱GLM', 'zhipu', 'https://open.bigmodel.cn/api/paas/v4/chat/completions', 
+                    '2259e33a1357460abe17919aaf81e73d.K44a8LPQTmFM5PKm', 'glm-4.5-air', 1)
+        ''')
+    
+    # 初始化默认搜索配置
+    cursor.execute('SELECT COUNT(*) FROM search_configs')
+    if cursor.fetchone()[0] == 0:
+        cursor.execute('''
+            INSERT INTO search_configs (name, provider, api_url, api_key, is_default)
+            VALUES ('Tavily', 'tavily', 'https://api.tavily.com/search', 
+                    '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', 1)
+        ''')
+    
+    # 初始化默认智能体
+    cursor.execute('SELECT COUNT(*) FROM agents')
+    if cursor.fetchone()[0] == 0:
+        default_agents = [
+            ('assistant', '通用助手', '🤖', 'hot', '能回答各类问题，帮助写作、分析、解答疑惑', '你是一个智能助手，能够回答各类问题，帮助用户解决问题。', 9500),
+            ('writer', '写作助手', '✍️', 'hot', '专注于文章写作、文案创作、内容润色', '你是一个专业的写作助手，擅长各类文章写作、文案创作和内容润色。', 8800),
+            ('coder', '编程助手', '👨‍💻', 'hot', '精通编程语言，解答技术问题，生成代码', '你是一个专业的编程助手，精通各类编程语言，能够解答技术问题并生成高质量代码。', 8500),
+            ('translator', '翻译助手', '🌐', 'hot', '多语言翻译，精准表达，文化适配', '你是一个专业的翻译助手，精通多语言翻译，能够精准表达并适配文化差异。', 7200),
+            ('work', '工作助手', '💼', 'work', '职场问题解答，工作效率提升', '你是一个工作助手，帮助解决职场问题，提升工作效率。', 5000),
+            ('ppt', 'PPT助手', '📊', 'work', 'PPT内容生成，结构优化，设计建议', '你是一个PPT助手，擅长PPT内容生成、结构优化和设计建议。', 4500),
+            ('excel', 'Excel助手', '📈', 'work', 'Excel公式、数据分析、表格优化', '你是一个Excel助手，精通Excel公式、数据分析和表格优化。', 4000),
+            ('teacher', '学习助手', '📚', 'study', '知识讲解，学习方法，考试辅导', '你是一个学习助手，擅长知识讲解、学习方法指导和考试辅导。', 5500),
+            ('english', '英语助手', '🔤', 'study', '英语学习，语法纠正，口语练习', '你是一个英语助手，帮助英语学习、语法纠正和口语练习。', 5000),
+            ('math', '数学助手', '🔢', 'study', '数学解题，公式推导，概念讲解', '你是一个数学助手，擅长数学解题、公式推导和概念讲解。', 4500),
+            ('health', '健康助手', '🏥', 'life', '健康咨询，养生建议，运动指导', '你是一个健康助手，提供健康咨询、养生建议和运动指导。', 3500),
+            ('travel', '旅行助手', '✈️', 'life', '旅行规划，景点推荐，美食指南', '你是一个旅行助手，擅长旅行规划、景点推荐和美食指南。', 3200),
+            ('food', '美食助手', '🍳', 'life', '菜谱推荐，烹饪技巧，营养搭配', '你是一个美食助手，提供菜谱推荐、烹饪技巧和营养搭配建议。', 3000),
+        ]
+        for agent in default_agents:
+            cursor.execute('''
+                INSERT INTO agents (agent_id, name, avatar, category, description, system_prompt, heat)
+                VALUES (?, ?, ?, ?, ?, ?, ?)
+            ''', agent)
+    
+    # 初始化系统配置
+    cursor.execute('SELECT COUNT(*) FROM system_configs')
+    if cursor.fetchone()[0] == 0:
+        default_configs = [
+            ('app_name', 'AI助手', '应用名称'),
+            ('app_version', '3.5.1', '应用版本'),
+            ('llm_provider', 'zhipu', '默认大模型提供商'),
+            ('enable_search', 'true', '是否启用联网搜索'),
+            ('guest_chat_sessions', '1', '游客每日对话会话限制'),
+            ('guest_chat_messages', '20', '游客每日对话消息限制'),
+            ('guest_agent_messages', '20', '游客每日智能体消息限制'),
+            ('admin_password', 'admin123', '管理员密码'),
+        ]
+        for key, value, desc in default_configs:
+            cursor.execute('INSERT INTO system_configs (key, value, description) VALUES (?, ?, ?)', (key, value, desc))
+    
+    # 初始化管理员账户
+    cursor.execute('SELECT COUNT(*) FROM admin_users')
+    if cursor.fetchone()[0] == 0:
+        cursor.execute('INSERT INTO admin_users (username, password_hash) VALUES (?, ?', 
+                       (ADMIN_USERNAME, ADMIN_PASSWORD_HASH))
+    
+    conn.commit()
+    conn.close()
+
+
+# ==================== 前端静态文件服务 ====================
+
+@app.route('/')
+def index():
+    """前端首页"""
+    return send_from_directory(app.static_folder, 'index.html')
+
+
+@app.route('/admin')
+def admin():
+    """后台管理页面"""
+    return send_from_directory(app.static_folder, 'admin.html')
+
+
+@app.route('/admin/<path:path>')
+def admin_static(path):
+    """后台管理静态文件"""
+    return send_from_directory(app.static_folder, path)
+
+
+@app.route('/<path:path>')
+def static_files(path):
+    """前端静态文件"""
+    return send_from_directory(app.static_folder, path)
+
+
+# ==================== 后台管理 API ====================
+
+# 管理员登录验证
+def check_admin_auth():
+    """检查管理员权限"""
+    auth = request.authorization
+    if not auth:
+        return False
+    password_hash = hashlib.sha256(auth.password.encode()).hexdigest()
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM admin_users WHERE username = ? AND password_hash = ?', 
+                   (auth.username, password_hash))
+    user = cursor.fetchone()
+    conn.close()
+    return user is not None
+
+
+@app.route('/api/admin/login', methods=['POST'])
+def admin_login():
+    """管理员登录"""
+    data = request.json
+    username = data.get('username')
+    password = data.get('password')
+    
+    if not username or not password:
+        return jsonify({'error': '请输入用户名和密码'}), 400
+    
+    password_hash = hashlib.sha256(password.encode()).hexdigest()
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM admin_users WHERE username = ? AND password_hash = ?', 
+                   (username, password_hash))
+    user = cursor.fetchone()
+    conn.close()
+    
+    if user:
+        return jsonify({'success': True, 'message': '登录成功'})
+    else:
+        return jsonify({'error': '用户名或密码错误'}), 401
+
+
+# ==================== 大模型接口管理 ====================
+
+@app.route('/api/admin/llm', methods=['GET'])
+def get_llm_configs():
+    """获取所有大模型配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM llm_configs ORDER BY is_default DESC, created_at DESC')
+    configs = [dict(row) for row in cursor.fetchall()]
+    conn.close()
+    return jsonify(configs)
+
+
+@app.route('/api/admin/llm', methods=['POST'])
+def add_llm_config():
+    """添加大模型配置"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        INSERT INTO llm_configs (name, provider, api_url, api_key, model, max_tokens, temperature)
+        VALUES (?, ?, ?, ?, ?, ?, ?)
+    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
+          data['model'], data.get('max_tokens', 2048), data.get('temperature', 0.7)))
+    conn.commit()
+    config_id = cursor.lastrowid
+    conn.close()
+    return jsonify({'success': True, 'id': config_id})
+
+
+@app.route('/api/admin/llm/<int:id>', methods=['PUT'])
+def update_llm_config(id):
+    """更新大模型配置"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        UPDATE llm_configs SET name=?, provider=?, api_url=?, api_key=?, model=?, 
+        max_tokens=?, temperature=?, updated_at=CURRENT_TIMESTAMP WHERE id=?
+    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
+          data['model'], data.get('max_tokens', 2048), data.get('temperature', 0.7), id))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/llm/<int:id>', methods=['DELETE'])
+def delete_llm_config(id):
+    """删除大模型配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('DELETE FROM llm_configs WHERE id=?', (id,))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/llm/<int:id>/default', methods=['POST'])
+def set_default_llm(id):
+    """设置默认大模型"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('UPDATE llm_configs SET is_default=0')
+    cursor.execute('UPDATE llm_configs SET is_default=1 WHERE id=?', (id,))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+# ==================== 智能体管理 ====================
+
+@app.route('/api/admin/agents', methods=['GET'])
+def get_agents():
+    """获取所有智能体"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM agents ORDER BY category, heat DESC')
+    agents = [dict(row) for row in cursor.fetchall()]
+    conn.close()
+    return jsonify(agents)
+
+
+@app.route('/api/admin/agents', methods=['POST'])
+def add_agent():
+    """添加智能体"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        INSERT INTO agents (agent_id, name, avatar, category, description, system_prompt, 
+        llm_config_id, temperature, max_tokens, enable_search, tags, heat)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    ''', (data['agent_id'], data['name'], data.get('avatar', '🤖'), data['category'], 
+          data.get('description', ''), data['system_prompt'], data.get('llm_config_id'),
+          data.get('temperature', 0.7), data.get('max_tokens', 2048), 
+          data.get('enable_search', 0), data.get('tags', ''), data.get('heat', 0)))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/agents/<agent_id>', methods=['PUT'])
+def update_agent(agent_id):
+    """更新智能体"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        UPDATE agents SET name=?, avatar=?, category=?, description=?, system_prompt=?, 
+        llm_config_id=?, temperature=?, max_tokens=?, enable_search=?, tags=?, heat=?, 
+        updated_at=CURRENT_TIMESTAMP WHERE agent_id=?
+    ''', (data['name'], data.get('avatar', '🤖'), data['category'], 
+          data.get('description', ''), data['system_prompt'], data.get('llm_config_id'),
+          data.get('temperature', 0.7), data.get('max_tokens', 2048), 
+          data.get('enable_search', 0), data.get('tags', ''), data.get('heat', 0), agent_id))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/agents/<agent_id>', methods=['DELETE'])
+def delete_agent(agent_id):
+    """删除智能体"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('DELETE FROM agents WHERE agent_id=?', (agent_id,))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+# ==================== 搜索配置管理 ====================
+
+@app.route('/api/admin/search', methods=['GET'])
+def get_search_configs():
+    """获取搜索配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM search_configs ORDER BY is_default DESC')
+    configs = [dict(row) for row in cursor.fetchall()]
+    conn.close()
+    return jsonify(configs)
+
+
+@app.route('/api/admin/search', methods=['POST'])
+def add_search_config():
+    """添加搜索配置"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        INSERT INTO search_configs (name, provider, api_url, api_key, max_results)
+        VALUES (?, ?, ?, ?, ?)
+    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
+          data.get('max_results', 10)))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/search/<int:id>', methods=['PUT'])
+def update_search_config(id):
+    """更新搜索配置"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('''
+        UPDATE search_configs SET name=?, provider=?, api_url=?, api_key=?, max_results=?, 
+        updated_at=CURRENT_TIMESTAMP WHERE id=?
+    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
+          data.get('max_results', 10), id))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/search/<int:id>', methods=['DELETE'])
+def delete_search_config(id):
+    """删除搜索配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('DELETE FROM search_configs WHERE id=?', (id,))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+@app.route('/api/admin/search/<int:id>/default', methods=['POST'])
+def set_default_search(id):
+    """设置默认搜索"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('UPDATE search_configs SET is_default=0')
+    cursor.execute('UPDATE search_configs SET is_default=1 WHERE id=?', (id,))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+# ==================== 系统配置管理 ====================
+
+@app.route('/api/admin/system', methods=['GET'])
+def get_system_configs():
+    """获取系统配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('SELECT * FROM system_configs')
+    configs = {row['key']: {'value': row['value'], 'description': row['description']} 
+               for row in cursor.fetchall()}
+    conn.close()
+    return jsonify(configs)
+
+
+@app.route('/api/admin/system', methods=['POST'])
+def update_system_config():
+    """更新系统配置"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    for key, value in data.items():
+        cursor.execute('''
+            UPDATE system_configs SET value=?, updated_at=CURRENT_TIMESTAMP WHERE key=?
+        ''', (value, key))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+# ==================== 统计信息 ====================
+
+@app.route('/api/admin/stats', methods=['GET'])
+def get_stats():
+    """获取统计信息"""
+    conn = get_db()
+    cursor = conn.cursor()
+    
+    # 今日统计
+    today = datetime.now().strftime('%Y-%m-%d')
+    
+    # 各类型统计
+    stats = {}
+    
+    # LLM调用统计
+    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="llm_call"')
+    stats['llm_total_calls'] = cursor.fetchone()[0] or 0
+    
+    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="llm_call" AND created_at >= ?', (today,))
+    stats['llm_today_calls'] = cursor.fetchone()[0] or 0
+    
+    # 搜索统计
+    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="search_call"')
+    stats['search_total_calls'] = cursor.fetchone()[0] or 0
+    
+    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="search_call" AND created_at >= ?', (today,))
+    stats['search_today_calls'] = cursor.fetchone()[0] or 0
+    
+    # 智能体使用统计
+    cursor.execute('''
+        SELECT log_key, SUM(log_value) as count FROM stats_logs 
+        WHERE log_type="agent_use" GROUP BY log_key ORDER BY count DESC LIMIT 10
+    ''')
+    stats['agent_usage'] = [dict(row) for row in cursor.fetchall()]
+    
+    # 用户统计
+    cursor.execute('SELECT COUNT(*) FROM stats_logs WHERE log_type="user_register"')
+    stats['total_users'] = cursor.fetchone()[0] or 0
+    
+    # 智能体数量
+    cursor.execute('SELECT COUNT(*) FROM agents WHERE is_active=1')
+    stats['agent_count'] = cursor.fetchone()[0]
+    
+    # LLM配置数量
+    cursor.execute('SELECT COUNT(*) FROM llm_configs WHERE is_active=1')
+    stats['llm_count'] = cursor.fetchone()[0]
+    
+    conn.close()
+    return jsonify(stats)
+
+
+@app.route('/api/admin/stats/log', methods=['POST'])
+def log_stats():
+    """记录统计日志"""
+    data = request.json
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute('INSERT INTO stats_logs (log_type, log_key, log_value) VALUES (?, ?, ?)',
+                   (data['type'], data.get('key', ''), data.get('value', 1)))
+    conn.commit()
+    conn.close()
+    return jsonify({'success': True})
+
+
+# ==================== 前端配置获取 ====================
+
+@app.route('/api/config', methods=['GET'])
+def get_frontend_config():
+    """获取前端使用的配置"""
+    conn = get_db()
+    cursor = conn.cursor()
+    
+    # 获取默认LLM配置
+    cursor.execute('SELECT * FROM llm_configs WHERE is_default=1 AND is_active=1 LIMIT 1')
+    llm = cursor.fetchone()
+    
+    # 获取默认搜索配置
+    cursor.execute('SELECT * FROM search_configs WHERE is_default=1 AND is_active=1 LIMIT 1')
+    search = cursor.fetchone()
+    
+    # 获取所有智能体
+    cursor.execute('SELECT agent_id, name, avatar, category, description, system_prompt, heat FROM agents WHERE is_active=1')
+    agents = [dict(row) for row in cursor.fetchall()]
+    
+    # 获取系统配置
+    cursor.execute('SELECT key, value FROM system_configs')
+    system = {row['key']: row['value'] for row in cursor.fetchall()}
+    
+    conn.close()
+    
+    config = {
+        'llm': dict(llm) if llm else None,
+        'search': dict(search) if search else None,
+        'agents': agents,
+        'system': {
+            'appName': system.get('app_name', 'AI助手'),
+            'version': system.get('app_version', '3.5.1'),
+            'enableSearch': system.get('enable_search', 'true') == 'true',
+            'guestLimits': {
+                'chatSessions': int(system.get('guest_chat_sessions', '1')),
+                'chatMessages': int(system.get('guest_chat_messages', '20')),
+                'agentMessages': int(system.get('guest_agent_messages', '20')),
+            }
+        }
+    }
+    
+    return jsonify(config)
+
+
+# ==================== 启动 ====================
+
+if __name__ == '__main__':
+    # 初始化数据库
+    init_db()
+    
+    # 启动服务
+    print('🚀 AI Chat App Backend started on http://localhost:19020')
+    print('📊 Admin Panel: http://localhost:19020/admin')
+    print('👤 Default admin: admin / admin123')
+    
+    app.run(host='0.0.0.0', port=19020, debug=True)