feat: 添加对话功能

新增功能:
- 对话页面 (/chat)
- 选择不同模型进行对话
- 历史对话保存和加载
- 支持继续历史对话

API:
- GET /api/chat/models - 获取可用模型
- GET /api/chat/list - 获取对话列表
- GET /api/chat/<id> - 获取对话详情
- POST /api/chat/send - 发送消息
- DELETE /api/chat/<id> - 删除对话
- POST /api/chat/<id>/clear - 清空对话

admin/app.py

@@ -94,6 +94,10 @@ def logs_page():
 def config_page():
     return render_template('config.html')
 
+@app.route('/chat')
+def chat_page():
+    return render_template('chat.html')
+
 @app.route('/auto-profiles')
 def auto_profiles_page():
     return render_template('auto-profiles.html')
@@ -431,6 +435,206 @@ def api_reload_config():
     # 这里只返回成功，实际重载由主服务自己处理
     return jsonify({'success': True, 'message': 'Config saved, restart main service to apply'})
 
+
+# ============ 对话功能 ============
+
+CHATS_FILE = DATA_DIR / 'chats.json'
+
+def load_chats():
+    """加载对话数据"""
+    if CHATS_FILE.exists():
+        return json.loads(CHATS_FILE.read_text(encoding='utf-8'))
+    return {'chats': []}
+
+def save_chats(data):
+    """保存对话数据"""
+    CHATS_FILE.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding='utf-8')
+
+
+@app.route('/api/chat/models')
+def api_chat_models():
+    """获取可用模型列表"""
+    providers = get_providers()
+    profiles = get_auto_profiles()
+    
+    models = []
+    added = set()
+    
+    # 添加所有auto配置
+    for name, profile in profiles.items():
+        if name not in added:
+            models.append({
+                'id': name,
+                'description': profile.get('description', 'Auto-select')
+            })
+            added.add(name)
+    
+    # 添加提供商的模型
+    for provider in providers:
+        if not provider['enabled']:
+            continue
+        for model in provider['models']:
+            if model not in added:
+                models.append({
+                    'id': model,
+                    'description': provider['name']
+                })
+                added.add(model)
+    
+    return jsonify(models)
+
+
+@app.route('/api/chat/list')
+def api_chat_list():
+    """获取对话列表"""
+    data = load_chats()
+    
+    chats = []
+    for chat in data.get('chats', []):
+        chats.append({
+            'id': chat['id'],
+            'title': chat.get('title', '新对话'),
+            'model': chat.get('model', 'auto'),
+            'message_count': len(chat.get('messages', [])),
+            'created_at': chat.get('created_at'),
+            'updated_at': chat.get('updated_at')
+        })
+    
+    # 按更新时间倒序
+    chats.sort(key=lambda x: x.get('updated_at', ''), reverse=True)
+    
+    return jsonify(chats)
+
+
+@app.route('/api/chat/<chat_id>')
+def api_chat_detail(chat_id):
+    """获取对话详情"""
+    data = load_chats()
+    
+    for chat in data.get('chats', []):
+        if chat['id'] == chat_id:
+            return jsonify(chat)
+    
+    return jsonify({'error': 'Chat not found'}), 404
+
+
+@app.route('/api/chat/send', methods=['POST'])
+def api_chat_send():
+    """发送消息"""
+    req = request.get_json()
+    
+    user_message = req.get('message', '')
+    model = req.get('model', 'auto')
+    chat_id = req.get('chat_id')
+    
+    if not user_message:
+        return jsonify({'error': 'Message is required'}), 400
+    
+    data = load_chats()
+    
+    # 查找或创建对话
+    chat = None
+    if chat_id:
+        for c in data['chats']:
+            if c['id'] == chat_id:
+                chat = c
+                break
+    
+    if not chat:
+        chat_id = str(uuid.uuid4())[:8]
+        chat = {
+            'id': chat_id,
+            'title': '新对话',
+            'model': model,
+            'messages': [],
+            'created_at': datetime.now().isoformat(),
+            'updated_at': datetime.now().isoformat()
+        }
+        data['chats'].append(chat)
+    
+    # 添加用户消息
+    chat['messages'].append({
+        'role': 'user',
+        'content': user_message,
+        'time': datetime.now().isoformat()
+    })
+    
+    # 调用LLM API
+    try:
+        proxy_url = f"http://localhost:{SERVER_CONFIG['port']}/v1/chat/completions"
+        
+        # 构建消息历史
+        messages = []
+        for msg in chat['messages'][-20:]:  # 最多保留20条历史
+            messages.append({
+                'role': msg['role'],
+                'content': msg['content']
+            })
+        
+        response = requests.post(proxy_url, json={
+            'model': model,
+            'messages': messages,
+            'stream': False
+        }, timeout=120)
+        
+        if response.status_code == 200:
+            result = response.json()
+            assistant_message = result['choices'][0]['message']['content']
+            used_model = result.get('model', model)
+            
+            # 添加助手消息
+            chat['messages'].append({
+                'role': 'assistant',
+                'content': assistant_message,
+                'model': used_model,
+                'time': datetime.now().isoformat()
+            })
+            
+            # 更新标题（如果是第一条消息）
+            if len(chat['messages']) == 2:
+                chat['title'] = user_message[:30] + ('...' if len(user_message) > 30 else '')
+            
+            chat['updated_at'] = datetime.now().isoformat()
+            save_chats(data)
+            
+            return jsonify({
+                'success': True,
+                'chat_id': chat_id,
+                'response': assistant_message,
+                'model': used_model,
+                'title': chat['title']
+            })
+        else:
+            error_msg = response.json().get('error', {}).get('message', 'Unknown error')
+            return jsonify({'error': error_msg}), response.status_code
+            
+    except Exception as e:
+        return jsonify({'error': str(e)}), 500
+
+
+@app.route('/api/chat/<chat_id>', methods=['DELETE'])
+def api_delete_chat(chat_id):
+    """删除对话"""
+    data = load_chats()
+    data['chats'] = [c for c in data['chats'] if c['id'] != chat_id]
+    save_chats(data)
+    return jsonify({'success': True})
+
+
+@app.route('/api/chat/<chat_id>/clear', methods=['POST'])
+def api_clear_chat(chat_id):
+    """清空对话消息"""
+    data = load_chats()
+    
+    for chat in data['chats']:
+        if chat['id'] == chat_id:
+            chat['messages'] = []
+            chat['updated_at'] = datetime.now().isoformat()
+            save_chats(data)
+            return jsonify({'success': True})
+    
+    return jsonify({'error': 'Chat not found'}), 404
+
 @app.route('/api/requests/recent')
 def api_recent_requests():
     """获取最近请求记录"""