refactor(apps): simplify API layer by removing redundant wrapper classes

- Remove ApiClientWrapper and MockApiClientWrapper
- Simplify IApiClient interface
- Update dependency injection configuration
- Optimize calendar service and AG-UI chat models

apps/lib/core/api/api_client.dart

@@ -1,9 +1,10 @@
 import 'package:dio/dio.dart';
 import 'api_exception.dart';
 import 'api_interceptor.dart';
+import 'i_api_client.dart';
 import '../storage/token_storage.dart';
 
-class ApiClient {
+class ApiClient implements IApiClient {
   final Dio _dio;
   final TokenStorage _tokenStorage;
   final ApiInterceptor _interceptor;
@@ -44,6 +45,7 @@ class ApiClient {
     };
   }
 
+  @override
   Future<Response<T>> get<T>(String path, {Options? options}) async {
     try {
       return await _dio.get<T>(path, options: options);
@@ -52,6 +54,7 @@ class ApiClient {
     }
   }
 
+  @override
   Future<Response<T>> post<T>(
     String path, {
     dynamic data,
@@ -64,6 +67,7 @@ class ApiClient {
     }
   }
 
+  @override
   Future<Response<T>> patch<T>(
     String path, {
     dynamic data,
@@ -76,6 +80,7 @@ class ApiClient {
     }
   }
 
+  @override
   Future<Response<T>> delete<T>(
     String path, {
     dynamic data,

apps/lib/core/api/i_api_client.dart

@@ -1,6 +1,4 @@
 import 'package:dio/dio.dart';
-import 'api_client.dart';
-import 'mock_api_client.dart';
 
 abstract class IApiClient {
   Future<Response<T>> get<T>(String path, {Options? options});
@@ -8,53 +6,3 @@ abstract class IApiClient {
   Future<Response<T>> patch<T>(String path, {dynamic data, Options? options});
   Future<Response<T>> delete<T>(String path, {dynamic data, Options? options});
 }
-
-class ApiClientWrapper implements IApiClient {
-  final ApiClient _client;
-
-  ApiClientWrapper(this._client);
-
-  @override
-  Future<Response<T>> get<T>(String path, {Options? options}) =>
-      _client.get(path, options: options);
-
-  @override
-  Future<Response<T>> post<T>(String path, {dynamic data, Options? options}) =>
-      _client.post(path, data: data, options: options);
-
-  @override
-  Future<Response<T>> patch<T>(String path, {dynamic data, Options? options}) =>
-      _client.patch(path, data: data, options: options);
-
-  @override
-  Future<Response<T>> delete<T>(
-    String path, {
-    dynamic data,
-    Options? options,
-  }) => _client.delete(path, data: data, options: options);
-}
-
-class MockApiClientWrapper implements IApiClient {
-  final MockApiClient _client;
-
-  MockApiClientWrapper(this._client);
-
-  @override
-  Future<Response<T>> get<T>(String path, {Options? options}) =>
-      _client.get(path, options: options);
-
-  @override
-  Future<Response<T>> post<T>(String path, {dynamic data, Options? options}) =>
-      _client.post(path, data: data, options: options);
-
-  @override
-  Future<Response<T>> patch<T>(String path, {dynamic data, Options? options}) =>
-      _client.patch(path, data: data, options: options);
-
-  @override
-  Future<Response<T>> delete<T>(
-    String path, {
-    dynamic data,
-    Options? options,
-  }) => _client.delete(path, data: data, options: options);
-}

apps/lib/core/api/mock_api_client.dart

@@ -1,9 +1,12 @@
 import 'package:dio/dio.dart';
+import 'i_api_client.dart';
 
-class MockApiClient {
-  final Map<String, _MockHandler> _handlers = {};
+typedef MockHandler = dynamic Function(dynamic data);
 
-  void registerHandler(String path, String method, _MockHandler handler) {
+class MockApiClient implements IApiClient {
+  final Map<String, MockHandler> _handlers = {};
+
+  void registerHandler(String path, String method, MockHandler handler) {
     final key = '$path:$method';
     _handlers[key] = handler;
   }
@@ -12,10 +15,12 @@ class MockApiClient {
     _handlers.clear();
   }
 
+  @override
   Future<Response<T>> get<T>(String path, {Options? options}) async {
     return _handleRequest('GET', path, options: options);
   }
 
+  @override
   Future<Response<T>> post<T>(
     String path, {
     dynamic data,
@@ -24,6 +29,7 @@ class MockApiClient {
     return _handleRequest('POST', path, data: data, options: options);
   }
 
+  @override
   Future<Response<T>> patch<T>(
     String path, {
     dynamic data,
@@ -32,6 +38,7 @@ class MockApiClient {
     return _handleRequest('PATCH', path, data: data, options: options);
   }
 
+  @override
   Future<Response<T>> delete<T>(
     String path, {
     dynamic data,
@@ -70,18 +77,3 @@ class MockApiClient {
     );
   }
 }
-
-typedef _MockHandler = dynamic Function(dynamic data);
-
-class MockApiClientHolder {
-  static MockApiClient? _instance;
-
-  static MockApiClient get instance {
-    _instance ??= MockApiClient();
-    return _instance!;
-  }
-
-  static void reset() {
-    _instance = null;
-  }
-}