fix(registry): correct getId function for LocalAd model

- Update getId function in modelRegistry and DatabaseSeedingService
- Remove unnecessary type casting and 'as' operator
- Simplify getId implementation to directly access ad.id

Author: fulleni

lib/src/registry/model_registry.dart

@@ -364,7 +364,7 @@ final modelRegistry = <String, ModelConfig<dynamic>>{
   ),
   'local_ad': ModelConfig<LocalAd>(
     fromJson: LocalAd.fromJson,
-    getId: (ad) => (ad as dynamic).id as String, // Corrected to access id
+    getId: (ad) => ad.id,
     getOwnerId: null, // LocalAd is a global resource, not user-owned
     getCollectionPermission: const ModelActionPermission(
       type: RequiredPermissionType.specificPermission,

lib/src/services/database_seeding_service.dart

@@ -48,7 +48,7 @@ class DatabaseSeedingService {
     await _seedCollection<LocalAd>(
       collectionName: 'local_ads',
       fixtureData: localAdsFixturesData,
-      getId: (item) => (item as dynamic).id as String,
+      getId: (ad) => ad.id,
       // ignore: unnecessary_lambdas
       toJson: (item) => LocalAd.toJson(item),
     );