Admins can toggle maintenance mode from the admin dashboard (new
"Wartung" tab). When active, all non-admin users see a full-page
maintenance screen instead of the app.
- Backend: GET /api/config/service-mode endpoint (authenticated)
- Backend: stores state in app_settings key 'service_mode'
- Frontend: ServiceModeGuard wraps all ProtectedRoutes
- Frontend: ServiceModePage full-screen maintenance UI
- Frontend: ServiceModeTab in admin dashboard with toggle + message
- Admins (dashboard_admin group) always bypass the guard
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Link categories to user groups via new zielgruppen column on
veranstaltung_kategorien (migration 017), editable in the category
management UI with group checkboxes and chip display
- Fix broken iCal share link by adding ICAL_BASE_URL to docker-compose
and falling back to CORS_ORIGIN when ICAL_BASE_URL is unset
- Remove the colored-dot legend footer from the month calendar view
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
