fix: 搜索功能修复

- 添加详细日志帮助调试
- 搜索结果发送到前端展示
- 前端增加搜索结果展示组件
- 修复 datetime 导入错误

main_v2.py

@@ -783,11 +783,19 @@ async def websocket_endpoint(websocket: WebSocket, user_id: str):
                     
                     # 检查是否需要执行搜索
                     search_context = None
+                    search_results_for_client = None  # 用于发送给前端
+                    logger.info(f"检查搜索条件: agent_tools={agent_tools}, disabled_tools={disabled_tools}")
+                    
                     if 'search' in agent_tools and 'search' not in disabled_tools:
-                        # 只要启用了搜索工具且未禁用，就执行搜索（不再依赖关键词检测）
-                        should_search = True
+                        # 只要启用了搜索工具且未禁用，就执行搜索
+                        logger.info("搜索条件满足，开始执行搜索")
                         
-                        if should_search:
+                        # 执行搜索
+                        tool_service = ToolService(db)
+                        search_tool = tool_service.get_default_tool('search')
+                        logger.info(f"获取到搜索工具: {search_tool.name if search_tool else 'None'}")
+                        
+                        if search_tool and search_tool.config.get('api_key'):
                             # 执行搜索
                             tool_service = ToolService(db)
                             search_tool = tool_service.get_default_tool('search')
@@ -815,12 +823,30 @@ async def websocket_endpoint(websocket: WebSocket, user_id: str):
                                     duration_ms = int((time.time() - start_time) * 1000)
                                     
                                     if search_result.get("results"):
-                                        # 构建搜索上下文
+                                        # 构建搜索上下文（给LLM）
                                         search_context = "\n\n【搜索结果】\n"
                                         for i, r in enumerate(search_result["results"][:5], 1):
                                             search_context += f"{i}. {r.get('title', 'N/A')}\n   {r.get('content', r.get('snippet', 'N/A'))[:200]}\n   来源: {r.get('url', 'N/A')}\n"
                                         logger.info(f"搜索完成: {len(search_result['results'])} 条结果")
                                         
+                                        # 构建搜索结果给前端展示
+                                        search_results_for_client = [
+                                            {
+                                                "title": r.get('title', 'N/A'),
+                                                "snippet": r.get('content', r.get('snippet', ''))[:150],
+                                                "url": r.get('url', 'N/A')
+                                            }
+                                            for r in search_result["results"][:5]
+                                        ]
+                                        
+                                        # 发送搜索结果给前端
+                                        await websocket.send_json({
+                                            "type": "search_results",
+                                            "conversation_id": conversation_id,
+                                            "results": search_results_for_client,
+                                            "query": message
+                                        })
+                                        
                                         # 更新统计和日志
                                         tool_service.increment_stats(search_tool.id, True)
                                         tool_service.log_usage({