fix: 搜索结果持久化保存，刷新页面后历史对话也显示搜索结果

- 用户消息 extra_data 存储搜索结果
- API 返回消息时包含 extra_data
- 前端 displayHistory 处理历史搜索结果显示

main_v2.py

@@ -648,6 +648,7 @@ async def get_messages(conversation_id: str, db: Session = Depends(get_db)):
                 "role": m.role,
                 "content": m.content,
                 "thinking_content": m.thinking_content,  # v2新增
+                "extra_data": m.extra_data,  # 包含搜索结果等
                 "source": m.source,
                 "agent_id": m.agent_id,  # v2新增
                 "model_used": m.model_used,  # v2新增
@@ -807,6 +808,7 @@ async def websocket_endpoint(websocket: WebSocket, user_id: str):
                     
                     # 4. 执行搜索并发送搜索结果
                     search_context = None
+                    search_results_for_client = None  # 用于发送给前端和保存
                     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:
@@ -888,12 +890,13 @@ async def websocket_endpoint(websocket: WebSocket, user_id: str):
                                     'duration_ms': duration_ms
                                 })
                     
-                    # 5. 保存用户消息到数据库
+                    # 5. 保存用户消息到数据库（包含搜索结果）
                     user_msg = conv_service.add_message(
                         conversation_id=conversation.id,
                         role='user',
                         content=message,
-                        source='web'
+                        source='web',
+                        extra_data={'search_results': search_results_for_client, 'search_query': message} if search_results_for_client else None
                     )
                     
                     # 6. 获取对话历史（包含刚保存的用户消息）

templates/index.html

@@ -622,7 +622,28 @@
         function displayHistory(messages) {
             const container = document.getElementById('messagesContainer');
             container.innerHTML = '';
-            messages.forEach(m => appendMessage(m.role, m.content, m.thinking_content));
+            messages.forEach(m => {
+                appendMessage(m.role, m.content, m.thinking_content);
+                // 如果用户消息有搜索结果，追加显示
+                if (m.role === 'user' && m.extra_data && m.extra_data.search_results) {
+                    displaySearchResultsForHistory(m.extra_data.search_results, m.extra_data.search_query || m.content);
+                }
+            });
+        }
+        
+        function displaySearchResultsForHistory(results, query) {
+            if (!results || results.length === 0) return;
+            
+            const container = document.getElementById('messagesContainer');
+            const userMessages = container.querySelectorAll('.message.user');
+            const lastUserMsg = userMessages[userMessages.length - 1];
+            
+            if (lastUserMsg) {
+                const msgBody = lastUserMsg.querySelector('.message-body');
+                if (msgBody) {
+                    msgBody.innerHTML += buildSearchResultsHtml(results, query);
+                }
+            }
         }
         
         function clearMessages() {