修复 admin 页面 JavaScript 花括号错误

logs/app.log

@@ -13,4 +13,3 @@ WARNING: This is a development server. Do not use it in a production deployment.
  * Running on http://127.0.0.1:16041
  * Running on http://192.168.0.101:16041
 Press CTRL+C to quit
-127.0.0.1 - - [10/Jul/2026 23:59:48] "GET /api/categories/export HTTP/1.1" 200 -

templates/admin.html

@@ -2823,7 +2823,7 @@
                 importData.categories.forEach(cat => {
                     html += `<span class="px-2 py-1 bg-blue-100 text-blue-700 rounded text-xs">${cat.name}</span>`;
                 });
-                html += '</div>';}
+                html += '</div>';
             } else if (importData.category) {
                 html += `<div class="font-medium text-gray-800"><i class="ri-folder-line mr-1"></i>单个分类: ${importData.category.name}</div>`;
             }