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/routes.dart

@@ -0,0 +1,10 @@
+class RouteConstants {
+  static const String splashPath = '/';
+  static const String habitsPath = '/habits';
+  static const String statisticsPath = '/statistics';
+  static const String settingsPath = '/settings';
+  static const String onboardingPath = '/onboarding';
+  static const String createHabitPath = '/create';
+  static const String editHabitPath = '/edit';
+  static const String whatsNewPath = '/whatsnew';
+}