refactor: mock清理+安全配置+通用组件+菜单优化

P0安全: SECRET_KEY/ADMIN_PASSWORD/CORS环境变量化, seed仅admin

P1Mock: mock.ts 301->88行, 删8数据mock+5generateMock, net-1300行

P2组件: useToast/useFetchList+ConfirmDialog/FormDialog

P3菜单: menuSections/menuItems->constants/menu.ts

P4API: NotificationsPage/WorkflowPage重写+RolesPage演示

测试: 1050passed, tsc clean

frontend/src/pages/InstanceGroupPage.tsx

@@ -103,25 +103,6 @@ const DEFAULT_QUOTA: ResourceQuota = {
   max_queries_per_day: 10000,
 };
 
-/* ───────── Mock Change Logs ───────── */
-
-function generateMockChangeLogs(groupId: number): ChangeLogEntry[] {
-  const actions = [
-    { action: '修改权限配置', target: 'query:select, query:insert' },
-    { action: '添加关联实例', target: '生产主库' },
-    { action: '移除关联用户', target: 'wangwu' },
-    { action: '更新资源配额', target: 'max_qps: 1000 -> 2000' },
-    { action: '启用权限组', target: '-' },
-  ];
-  return actions.map((a, i) => ({
-    id: `cl-${groupId}-${i}`,
-    user: ['admin', 'zhangsan', 'lisi'][i % 3],
-    action: a.action,
-    target: a.target,
-    created_at: new Date(Date.now() - i * 86400000).toISOString(),
-  }));
-}
-
 /* ───────── Main Component ───────── */
 
 export default function InstanceGroupPage() {
@@ -196,7 +177,7 @@ export default function InstanceGroupPage() {
 
   const changeLogs = useMemo(() => {
     if (!selectedId) return [];
-    return generateMockChangeLogs(selectedId);
+    return [];
   }, [selectedId]);
 
   const resetForm = () => {