feat: Implement Android native plugin with offline-first pipeline

- Add DailyNotificationPlugin main class with Capacitor integration
- Implement NotificationContent model following project directive schema
- Create DailyNotificationStorage with tiered storage approach
- Add DailyNotificationScheduler with exact/inexact alarm support
- Implement DailyNotificationFetcher for background content retrieval
- Create DailyNotificationReceiver for alarm handling
- Add WorkManager workers for background tasks and maintenance
- Implement prefetch → cache → schedule → display pipeline
- Add comprehensive error handling and logging
- Support battery optimization and adaptive scheduling

.gitignore

@@ -59,3 +59,5 @@ logs/
 *.tmp
 *.temp
 .cache/
+*.lock
+*.bin