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/repositories/sqlite_event_repository.dart

@@ -0,0 +1,47 @@
+import 'dart:collection';
+import 'package:habo/constants.dart';
+import 'package:habo/model/habo_model.dart';
+import 'package:habo/repositories/event_repository.dart';
+
+class SqliteEventRepository implements EventRepository {
+  final HaboModel _model;
+
+  SqliteEventRepository(this._model);
+
+  @override
+  Future<List<List>> getEventsForHabit(int habitId) async {
+    return _model.getEventsForHabit(habitId);
+  }
+
+  @override
+  Future<SplayTreeMap<DateTime, List>> getEventsMapForHabit(int habitId) async {
+    return _model.getEventsMapForHabit(habitId);
+  }
+
+  @override
+  Future<void> insertEvent(int habitId, DateTime date, List event) async {
+    await _model.insertEvent(habitId, date, event);
+  }
+
+  @override
+  Future<void> deleteEvent(int habitId, DateTime date) async {
+    await _model.deleteEvent(habitId, date);
+  }
+
+  @override
+  Future<void> deleteAllEventsForHabit(int habitId) async {
+    await _model.deleteAllEventsForHabit(habitId);
+  }
+
+  @override
+  Future<void> insertEventsForHabit(int habitId, Map<DateTime, List> events) async {
+    for (final entry in events.entries) {
+      await _model.insertEvent(habitId, entry.key, entry.value);
+    }
+  }
+
+  @override
+  Future<void> deleteAllEvents() async {
+    await _model.deleteAllEvents();
+  }
+}