perf(frontend,config): parallelize auth, virtualize logs, cache public configs

Frontend layout renders immediately; pages gate via RequireAuth and
useAuthRedirect. Login/register skip getUserInfo. Admin log panel uses
useVirtualizer to avoid 2000-row DOM. ListVisibleSystemConfigs caches
visibility=1 configs in Redis with invalidation on create/update.
PERFORMANCE.md marks completed optimizations.

frontend/app/(main)/admin/layout.tsx

@@ -1,35 +1,18 @@
 "use client"
 
-import { AdminUsersProvider } from "@/contexts/admin-users-context"
-import { useUser } from "@/contexts/user-context"
-import { LoadingPage } from "@/components/layout/loading"
-import { ErrorPage } from "@/components/layout/error"
+import {AdminUsersProvider} from "@/contexts/admin-users-context"
+import {RequireAdminAuth} from "@/components/auth/require-auth"
 
 export default function AdminLayout({
   children,
 }: {
   children: React.ReactNode
 }) {
-  const { user, loading } = useUser()
-
-  /* 等待用户信息加载完成 */
-  if (loading) {
-    return <LoadingPage text="管理后台" badgeText="管理" />
-  }
-
-  /* 权限检查：只有管理员才能访问 */
-  if (!user?.is_admin) {
-    return (
-      <ErrorPage
-        title="访问被拒绝"
-        message="您没有权限访问此页面"
-      />
-    )
-  }
-
   return (
-    <AdminUsersProvider>
-      {children}
-    </AdminUsersProvider>
+    <RequireAdminAuth>
+      <AdminUsersProvider>
+        {children}
+      </AdminUsersProvider>
+    </RequireAdminAuth>
   )
-}
+}