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

templates/index.html

@@ -86,6 +86,13 @@
         .thinking-toggle { font-size: 12px; color: #667eea; }
         .thinking-content { margin-top: 12px; display: none; }
         .thinking-content.expanded { display: block; }
+        .search-results-box { margin: 8px 0; padding: 12px; background: #f8f9fa; border-radius: 8px; border: 1px solid #e9ecef; }
+        .search-results-box h5 { margin: 0 0 8px; font-size: 14px; color: #495057; }
+        .search-result-item { margin-bottom: 8px; padding: 8px; background: white; border-radius: 6px; }
+        .search-result-item:last-child { margin-bottom: 0; }
+        .search-result-title { font-size: 13px; color: #10a37f; font-weight: 500; margin-bottom: 4px; }
+        .search-result-snippet { font-size: 12px; color: #666; line-height: 1.4; }
+        .search-result-url { font-size: 11px; color: #999; margin-top: 4px; }
         
         /* Agent信息 */
         .agent-info { font-size: 12px; color: #999; margin-top: 8px; }
@@ -286,6 +293,7 @@
                     document.getElementById('sendBtn').disabled = false;
                     break;
                 case 'error': showError(data.message); document.getElementById('sendBtn').disabled = false; break;
+                case 'search_results': displaySearchResults(data.results, data.query); break;
             }
         }
         
@@ -623,6 +631,33 @@
             container.appendChild(div);
         }
         
+        function displaySearchResults(results, query) {
+            if (!results || results.length === 0) return;
+            
+            const container = document.getElementById('messagesContainer');
+            const div = document.createElement('div');
+            div.className = 'message assistant';
+            
+            let html = `<div class="message-avatar">🔍</div><div class="message-body">
+                <div class="search-results-box">
+                    <h5>搜索: ${escapeHtml(query.substring(0, 50))}${query.length > 50 ? '...' : ''}</h5>`;
+            
+            for (const r of results) {
+                html += `<div class="search-result-item">
+                    <div class="search-result-title">${escapeHtml(r.title)}</div>
+                    <div class="search-result-snippet">${escapeHtml(r.snippet)}</div>
+                    <div class="search-result-url">${escapeHtml(r.url)}</div>
+                </div>`;
+            }
+            
+            html += '</div></div>';
+            div.innerHTML = html;
+            container.appendChild(div);
+            
+            // 滚动到底部
+            container.scrollTop = container.scrollHeight;
+        }
+        
         // 会话管理
         async function loadConversations() {
             const res = await fetch('/api/conversations');