refactor(dependencies): remove local ad repository

- Remove unused localAdRepository from AppDependencies
- Delete DataMongodb initialization for LocalAd

Author: fulleni

lib/src/config/app_dependencies.dart

@@ -63,7 +63,6 @@ class AppDependencies {
   late final DataRepository<UserContentPreferences>
   userContentPreferencesRepository;
   late final DataRepository<RemoteConfig> remoteConfigRepository;
-  late final DataRepository<LocalAd> localAdRepository;
   late final EmailRepository emailRepository;
 
   // Services
@@ -232,16 +231,6 @@ class AppDependencies {
 
       emailRepository = EmailRepository(emailClient: emailClient);
 
-      final localAdClient = DataMongodb<LocalAd>(
-        connectionManager: _mongoDbConnectionManager,
-        modelName: 'local_ads',
-        fromJson: LocalAd.fromJson,
-        toJson: LocalAd.toJson,
-        searchableFields: ['title'],
-        logger: Logger('DataMongodb<LocalAd>'),
-      );
-      localAdRepository = DataRepository(dataClient: localAdClient);
-
       // 5. Initialize Services
       tokenBlacklistService = MongoDbTokenBlacklistService(
         connectionManager: _mongoDbConnectionManager,