feat(android)!: implement Phase 2 Android core with WorkManager + AlarmManager + SQLite

- Add complete SQLite schema with Room database (content_cache, schedules, callbacks, history)
- Implement WorkManager FetchWorker with exponential backoff and network constraints
- Add AlarmManager NotifyReceiver with TTL-at-fire logic and notification delivery
- Create BootReceiver for automatic rescheduling after device reboot
- Update AndroidManifest.xml with necessary permissions and receivers
- Add Room, WorkManager, and Kotlin coroutines dependencies to build.gradle

feat(callback-registry)!: implement callback registry with circuit breaker

- Add CallbackRegistryImpl with HTTP, local, and queue callback support
- Implement circuit breaker pattern with exponential backoff retry logic
- Add CallbackEvent interface with structured event types
- Support for exactly-once delivery semantics with retry queue
- Include callback status monitoring and health checks

feat(observability)!: add comprehensive observability and health monitoring

- Implement ObservabilityManager with structured logging and event codes
- Add performance metrics tracking (fetch, notify, callback times)
- Create health status API with circuit breaker monitoring
- Include log compaction and metrics reset functionality
- Support for DNP-* event codes throughout the system

feat(web)!: enhance web implementation with new functionality

- Integrate callback registry and observability into web platform
- Add mock implementations for dual scheduling methods
- Implement performance tracking and structured logging
- Support for local callback registration and management
- Enhanced error handling and event logging

BREAKING CHANGE: New Android dependencies require Room, WorkManager, and Kotlin coroutines

android/app/src/main/AndroidManifest.xml

@@ -24,6 +24,24 @@
 
         </activity>
 
+        <!-- Daily Notification Plugin Receivers -->
+        <receiver
+            android:name="com.timesafari.dailynotification.NotifyReceiver"
+            android:enabled="true"
+            android:exported="false" />
+            
+        <receiver
+            android:name="com.timesafari.dailynotification.BootReceiver"
+            android:enabled="true"
+            android:exported="true">
+            <intent-filter android:priority="1000">
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
+                <action android:name="android.intent.action.PACKAGE_REPLACED" />
+                <data android:scheme="package" />
+            </intent-filter>
+        </receiver>
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.fileprovider"
@@ -36,6 +54,11 @@
     </application>
 
     <!-- Permissions -->
-
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
+    <uses-permission android:name="android.permission.USE_EXACT_ALARM" />
 </manifest>