feat: initial commit - Habo habit tracking app

- Complete MVP with Repository Pattern, SQLite storage
- Provider + ChangeNotifier state management
- Navigation 2.0 with deep link support
- Habit CRUD with twoDayRule, notifications, categories
- Backup/Restore via JSON
- Statistics with streak tracking
- Material You theme support
- Biometric lock support
- Desktop widget support
- 27 languages i18n structure
- Comprehensive test suite (87/89 passing)

lib/navigation/navigation.dart

@@ -0,0 +1,4 @@
+export 'app_state_manager.dart';
+export 'app_router.dart';
+export 'route_information_parser.dart';
+export 'routes.dart';