feat: implement frontend-backend configuration linkage

- Create public config API for frontend consumption
- Add configuration fetching to homepage
- Implement module show/hide logic based on config
- Add support for Services items filtering
- Add support for Products featured products and pricing display
- Add support for News display count, categories, and sort order
- Fix table name from 'configs' to 'siteConfig' in API route
- Update type definitions for proper TypeScript support

src/app/admin/users/page.tsx

@@ -38,6 +38,7 @@ export default function UsersPage() {
   const [showEditModal, setShowEditModal] = useState(false);
   const [selectedUser, setSelectedUser] = useState<User | null>(null);
   const [saving, setSaving] = useState(false);
+  const [deletingUserId, setDeletingUserId] = useState<string | null>(null);
 
   const [formData, setFormData] = useState({
     email: '',
@@ -94,20 +95,32 @@ export default function UsersPage() {
   };
 
   const handleDelete = async (userId: string) => {
-    if (!confirm('确定要删除此用户吗？')) {
+    if (deletingUserId) {
+      console.log('删除操作正在进行中，请勿重复点击');
+      return;
+    }
+
+    if (!confirm('确定要删除此用户吗？此操作不可恢复。')) {
       return;
     }
 
     try {
+      setDeletingUserId(userId);
       const res = await fetch(`/api/admin/users/${userId}`, {
         method: 'DELETE'
       });
 
       if (res.ok) {
         await fetchUsers();
+      } else {
+        const data = await res.json();
+        alert(data.error || '删除失败');
       }
     } catch (error) {
       console.error('删除用户失败:', error);
+      alert('删除失败，请稍后重试');
+    } finally {
+      setDeletingUserId(null);
     }
   };
 
@@ -196,7 +209,8 @@ export default function UsersPage() {
                   </td>
                   <td className="px-6 py-4 whitespace-nowrap text-right text-sm font-medium">
                     <button
-                      onClick={() => {
+                      onClick={(e) => {
+                        e.stopPropagation();
                         setSelectedUser(user);
                         setFormData({
                           email: user.email,
@@ -211,10 +225,18 @@ export default function UsersPage() {
                       <Edit className="h-4 w-4 inline" />
                     </button>
                     <button
-                      onClick={() => handleDelete(user.id)}
-                      className="text-red-600 hover:text-red-800"
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        handleDelete(user.id);
+                      }}
+                      disabled={deletingUserId === user.id}
+                      className="text-red-600 hover:text-red-800 disabled:opacity-50 disabled:cursor-not-allowed"
                     >
-                      <Trash2 className="h-4 w-4 inline" />
+                      {deletingUserId === user.id ? (
+                        <Loader2 className="h-4 w-4 inline animate-spin" />
+                      ) : (
+                        <Trash2 className="h-4 w-4 inline" />
+                      )}
                     </button>
                   </td>
                 </tr>