refactor: introduce base API service and core service for standardized API interaction and error handling.

apps/mobile/packages/core/lib/core.dart

@@ -8,4 +8,4 @@ export 'src/presentation/mixins/bloc_error_handler.dart';
 export 'src/presentation/observers/core_bloc_observer.dart';
 export 'src/config/app_config.dart';
 export 'src/routing/routing.dart';
-export 'src/services/api_service.dart';
+export 'src/services/api_service/api_service.dart';

apps/mobile/packages/core/lib/src/services/api_service/api_service.dart

@@ -5,7 +5,7 @@ import 'package:krow_domain/krow_domain.dart';
 ///
 /// This class provides a wrapper around [Dio]'s methods to handle
 /// response parsing and error handling in a consistent way.
-class ApiService {
+class ApiService implements BaseApiService {
   /// Creates an [ApiService] with the given [Dio] instance.
   ApiService(this._dio);
 
@@ -13,6 +13,7 @@ class ApiService {
   final Dio _dio;
 
   /// Performs a GET request to the specified [endpoint].
+  @override
   Future<ApiResponse> get(
     String endpoint, {
     Map<String, dynamic>? params,
@@ -29,6 +30,7 @@ class ApiService {
   }
 
   /// Performs a POST request to the specified [endpoint].
+  @override
   Future<ApiResponse> post(
     String endpoint, {
     dynamic data,
@@ -47,6 +49,7 @@ class ApiService {
   }
 
   /// Performs a PUT request to the specified [endpoint].
+  @override
   Future<ApiResponse> put(
     String endpoint, {
     dynamic data,
@@ -65,6 +68,7 @@ class ApiService {
   }
 
   /// Performs a PATCH request to the specified [endpoint].
+  @override
   Future<ApiResponse> patch(
     String endpoint, {
     dynamic data,