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

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() {