feat: punkt 5 (monitoring) — system dashboard backend+frontend, admin-only, auto-refresh 30s, alerting via notifications

frontend/src/routes/index.tsx

@@ -89,6 +89,7 @@ const LogsPlaceholderPage = React.lazy(() => import('@/pages/logs/LogsPlaceholde
 const HelpApiDocsPage = React.lazy(() => import('@/pages/help/HelpApiDocs').then(m => ({ default: m.HelpApiDocsPage })));
 const ApiDocsPage = React.lazy(() => import('@/pages/ApiDocs').then(m => ({ default: m.ApiDocsPage })));
 const WikiPage = React.lazy(() => import('@/pages/Wiki').then(m => ({ default: m.WikiPage })));
+const SystemDashboardPage = React.lazy(() => import('@/pages/SystemDashboard').then(m => ({ default: m.SystemDashboardPage })));
 
 /** Centered spinner fallback for lazy-loaded routes */
 function PageLoader() {
@@ -268,6 +269,7 @@ const router = createBrowserRouter([
       { path: '/api-docs', element: <PermissionRoute permission="settings:read">{withSuspense(<ApiDocsPage />)}</PermissionRoute> },
       { path: '/activity', element: <PermissionRoute permission="activity:read">{withSuspense(<ActivityTimelinePage />)}</PermissionRoute> },
       { path: '/wiki', element: withSuspense(<WikiPage />) },
+      { path: '/system-dashboard', element: withSuspense(<SystemDashboardPage />) },
       { path: '/profile', element: withSuspense(<SettingsProfilePage />) },
       { path: '*', element: <ErrorBoundary>{<PluginRouteRenderer />}</ErrorBoundary> },
     ],