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)

l10n.yaml

@@ -0,0 +1,7 @@
+arb-dir: lib/l10n
+template-arb-file: intl_en.arb
+output-localization-file: app_localizations.dart
+output-class: AppLocalizations
+synthetic-package: false
+output-dir: lib/generated
+nullable-getter: false