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)

.gitignore

@@ -0,0 +1,49 @@
+# Flutter/Dart
+.dart_tool/
+.packages
+.pub/
+build/
+*.iml
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Local config
+*.local
+.env
+
+# Coverage
+coverage/
+
+# Generated (but we keep l10n and generated code)
+# lib/generated/
+# linux/flutter/generated_*.h
+# linux/flutter/generated_plugin_registrant.cc
+
+# Android
+android/.gradle
+android/local.properties
+android/*/build/
+android/build/
+
+# iOS
+ios/.symlinks/
+ios/Pods/
+ios/Flutter/Generated.xcconfig
+ios/Flutter/ephemeral/
+ios/Flutter/Flutter.framework/
+
+# Linux
+linux/flutter/ephemeral/
+
+# macOS
+macos/Flutter/ephemeral/
+macos/Flutter/GeneratedPluginRegistrant.swift