feat: integrate daily notification plugin for native iOS/Android

Add native notification support via @timesafari/daily-notification-plugin
while maintaining existing Web Push for web/PWA builds. Platform detection
automatically selects the appropriate notification system at runtime.

Key Changes:
- Created NotificationService abstraction layer with unified API
- Implemented NativeNotificationService for iOS/Android
- Stubbed WebPushNotificationService for future web integration
- Registered DailyNotificationPlugin in Capacitor plugin system

Android Configuration:
- Added notification permissions (POST_NOTIFICATIONS, SCHEDULE_EXACT_ALARM, etc.)
- Registered DailyNotificationReceiver for alarm-based notifications
- Registered BootReceiver to restore schedules after device restart
- Added Room, WorkManager, and Coroutines dependencies
- Registered plugin in MainActivity.java

iOS Configuration:
- Added UIBackgroundModes (fetch, processing) to Info.plist
- Configured BGTaskSchedulerPermittedIdentifiers
- Added NSUserNotificationAlertStyle

Documentation:
- Created comprehensive integration guide
- Added architecture overview with diagrams
- Created implementation checklist
- Documented platform-specific behavior

Manual Steps Required:
- iOS: Enable Background Modes capability in Xcode
- iOS: Run `pod install` to install CapacitorDailyNotification pod
- Run `npx cap sync` to sync native projects

Platform Support:
- iOS: Native UNUserNotificationCenter (requires Xcode setup)
- Android: Native NotificationManager with AlarmManager
- Web/PWA: Existing Web Push (coexists, not yet wired to service)
- Electron: Ready (uses native implementation)

Status: Phase 1 complete - infrastructure ready for UI integration
Next: Update PushNotificationPermission.vue to use NotificationService

android/app/src/main/AndroidManifest.xml

@@ -52,6 +52,25 @@
         </provider>
     </application>
 
+        <!-- Daily Notification Plugin Receivers -->
+        <!-- ⚠️ CRITICAL: NotifyReceiver is required for alarm-based notifications -->
+        <receiver
+            android:name="com.timesafari.dailynotification.DailyNotificationReceiver"
+            android:enabled="true"
+            android:exported="false">
+        </receiver>
+
+        <!-- Boot receiver to restore notification schedules after device restart -->
+        <receiver
+            android:name="com.timesafari.dailynotification.BootReceiver"
+            android:enabled="true"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+    </application>
+
     <!-- Permissions -->
 
     <uses-permission android:name="android.permission.INTERNET" />
@@ -59,4 +78,11 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-feature android:name="android.hardware.camera" android:required="true" />
+    
+    <!-- Daily Notification Plugin Permissions -->
+    <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" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
 </manifest>