fix: brace mismatch in Classes fetchData try/catch/finally

apps/admin/src/pages/Classes/index.tsx

@@ -101,7 +101,7 @@ const ClassesPage: React.FC = () => {
     } catch (e: any) {
       message.error(e?.message || '加载失败，请稍后重试');
     }
-    } finally {
+    finally {
       setLoading(false);
     }
   }, [filterStatus, filterType, showArchived]);