refactor(dependencies): remove interest repository and update push notification service

- Remove DataRepository<Interest> and related initialization
- Update PushNotificationService to use userContentPreferencesRepository instead of interestRepository
- Adjust log message for InAppNotification data client initialization

Author: fulleni

lib/src/config/app_dependencies.dart

@@ -71,7 +71,6 @@ class AppDependencies {
   late final DataRepository<PushNotificationDevice>
   pushNotificationDeviceRepository;
   late final DataRepository<RemoteConfig> remoteConfigRepository;
-  late final DataRepository<Interest> interestRepository;
   late final DataRepository<InAppNotification> inAppNotificationRepository;
 
   late final EmailRepository emailRepository;
@@ -222,15 +221,6 @@ class AppDependencies {
         logger: Logger('DataMongodb<PushNotificationDevice>'),
       );
 
-      // Initialize Data Clients for new Interest and InAppNotification models
-      final interestClient = DataMongodb<Interest>(
-        connectionManager: _mongoDbConnectionManager,
-        modelName: 'interests',
-        fromJson: Interest.fromJson,
-        toJson: (item) => item.toJson(),
-        logger: Logger('DataMongodb<Interest>'),
-      );
-
       final inAppNotificationClient = DataMongodb<InAppNotification>(
         connectionManager: _mongoDbConnectionManager,
         modelName: 'in_app_notifications',
@@ -239,9 +229,7 @@ class AppDependencies {
         logger: Logger('DataMongodb<InAppNotification>'),
       );
 
-      _log.info(
-        'Initialized data clients for Interest and InAppNotification.',
-      );
+      _log.info('Initialized data client for InAppNotification.');
 
       // --- Conditionally Initialize Push Notification Clients ---
 
@@ -328,9 +316,6 @@ class AppDependencies {
       pushNotificationDeviceRepository = DataRepository(
         dataClient: pushNotificationDeviceClient,
       );
-      interestRepository = DataRepository(
-        dataClient: interestClient,
-      );
       inAppNotificationRepository = DataRepository(
         dataClient: inAppNotificationClient,
       );
@@ -398,7 +383,7 @@ class AppDependencies {
       );
       pushNotificationService = DefaultPushNotificationService(
         pushNotificationDeviceRepository: pushNotificationDeviceRepository,
-        interestRepository: interestRepository,
+        userContentPreferencesRepository: userContentPreferencesRepository,
         remoteConfigRepository: remoteConfigRepository,
         firebaseClient: firebasePushNotificationClient,
         oneSignalClient: oneSignalPushNotificationClient,