Code-split feature pages and admin shell with React.lazy

The dashboard (recharts, ~120 kB gzip), tracing, troubleshoot, actions and bootstrap wizard now load on demand, and the admin panel is split out of the entry chunk so anonymous visitors only download the login page (~134 kB gzip instead of ~557 kB).

src/pages/AdminPanel.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
  */
 
-import { useEffect, useMemo, useState } from 'react';
+import { lazy, Suspense, useEffect, useMemo, useState } from 'react';
 import { useParams, useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { useAuthStore } from '@/stores/authStore';
@@ -17,7 +17,7 @@ import { TopBar } from '@/components/layout/TopBar';
 import { Sidebar } from '@/components/layout/Sidebar';
 import { MainContent } from '@/components/layout/MainContent';
 import { ErrorBoundary } from '@/components/layout/ErrorBoundary';
-import { BootstrapWizard } from '@/components/bootstrap/BootstrapWizard';
+import { LoadingFallback } from '@/components/common/LoadingFallback';
 import {
   findFirstAccessibleLinkInLayout,
   findFirstVisibleLinkInLayout,
@@ -27,6 +27,11 @@ import {
 import { usePermissions } from '@/hooks/usePermissions';
 import { Loader2 } from 'lucide-react';
 
+// Bootstrap mode is a rare first-run flow; keep it out of the main chunk.
+const BootstrapWizard = lazy(() =>
+  import('@/components/bootstrap/BootstrapWizard').then((m) => ({ default: m.BootstrapWizard })),
+);
+
 export default function AdminPanel() {
   const { t } = useTranslation();
   const navigate = useNavigate();
@@ -237,7 +242,9 @@ export default function AdminPanel() {
   if (isBootstrapMode) {
     return (
       <ErrorBoundary>
-        <BootstrapWizard />
+        <Suspense fallback={<LoadingFallback fullScreen />}>
+          <BootstrapWizard />
+        </Suspense>
       </ErrorBoundary>
     );
   }