feat(admin): add danger zone buttons for resetting ratings and activations

- Added reset all user ratings button to admin danger zone
- Added reset all activations button to admin danger zone
- Created API endpoints: /api/admin/reset-ratings and /api/admin/reset-activations
- Removed old non-localized routes: /app/admin, /app/curator
- Removed unused page.module.css
- All admin functionality now uses localized routes (/[locale]/admin)

app/curator/page.tsx

@@ -1,11 +0,0 @@
-// Server-Wrapper für die Kuratoren-Seite.
-// Markiert die Route als dynamisch und rendert die eigentliche Client-Komponente.
-export const dynamic = 'force-dynamic';
-
-import CuratorPageClient from './CuratorPageClient';
-
-export default function CuratorPage() {
-    return <CuratorPageClient />;
-}
-
-