feat: add Security room with Users and Groups sections

- Add Security room accessible from main navigation
- Implement Users list page with DataGrid (fetches from /auth/users)
- Implement Groups list page with DataGrid (fetches from /auth/groups)
- Move user/group management from Control Room to dedicated Security room
- Remove Authentik section from Control Room navigation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/routing/app_router.dart

@@ -3,6 +3,7 @@ import 'package:go_router/go_router.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:tatlock_ui/features/control_room/router.dart';
 import 'package:tatlock_ui/features/front_hall/presentation/pages/front_hall_page.dart';
+import 'package:tatlock_ui/features/security/router.dart';
 import 'package:tatlock_ui/shared/layouts/app_scaffold.dart';
 
 part 'app_router.g.dart';
@@ -30,6 +31,7 @@ GoRouter appRouter(AppRouterRef ref) {
             builder: (context, state) => const FrontHallPage(),
           ),
           ...controlRoomRoutes(),
+          ...securityRoutes(),
           GoRoute(
             path: AppRoutes.parlor,
             name: 'parlor',