feat: #16/로그인 API 추가

1. AccountApi.login() 추가
2. MockApi를 ApiImpl 상속을 통해 중복 코드 제거

lib/core/network/api_response.dart

@@ -17,13 +17,19 @@ class ApiResponse<T> with _$ApiResponse<T> {
 abstract class FailResponse with _$FailResponse {
   const factory FailResponse({
     required int status,
-    required String error,
-    required String message,
-    required String devMessage,
+    @Default('') String error,
+    @Default('') String message,
+    @Default('') String devMessage,
   }) = _FailResponse;
 
   factory FailResponse.fromJson(Map<String, dynamic> json) =>
       _$FailResponseFromJson(json);
+
+  /// 서버 에러 시.
+  factory FailResponse.error() => const FailResponse(
+        status: 500,
+        message: '서버 에러',
+      );
 }
 
 extension ApiResponseExt on ApiResponse {

lib/core/network/api_response.freezed.dart

@@ -626,20 +626,23 @@ class __$$FailResponseImplCopyWithImpl<$Res>
 class _$FailResponseImpl implements _FailResponse {
   const _$FailResponseImpl(
       {required this.status,
-      required this.error,
-      required this.message,
-      required this.devMessage});
+      this.error = '',
+      this.message = '',
+      this.devMessage = ''});
 
   factory _$FailResponseImpl.fromJson(Map<String, dynamic> json) =>
       _$$FailResponseImplFromJson(json);
 
   @override
   final int status;
   @override
+  @JsonKey()
   final String error;
   @override
+  @JsonKey()
   final String message;
   @override
+  @JsonKey()
   final String devMessage;
 
   @override
@@ -683,9 +686,9 @@ class _$FailResponseImpl implements _FailResponse {
 abstract class _FailResponse implements FailResponse {
   const factory _FailResponse(
       {required final int status,
-      required final String error,
-      required final String message,
-      required final String devMessage}) = _$FailResponseImpl;
+      final String error,
+      final String message,
+      final String devMessage}) = _$FailResponseImpl;
 
   factory _FailResponse.fromJson(Map<String, dynamic> json) =
       _$FailResponseImpl.fromJson;

lib/feature/account/data/data_sources/dto/dto.dart

@@ -1 +1 @@
-export 'login/response/login_response_dto.dart';
+export 'login/login.dart';

lib/feature/account/data/data_sources/mock/mock_api.dart

@@ -1,3 +1,25 @@
+import 'dart:async';
+
+import 'package:withu_app/core/core.dart';
 import 'package:withu_app/feature/account/account.dart';
 
-class AccountMockApi extends AccountApi {}
+class AccountMockApi extends AccountApiImpl with MockAPI {
+  /// 로그인 API
+  @override
+  FutureOr<ApiResponse<LoginResponseDto>> login({
+    required LoginRequestDto requestData,
+  }) async {
+    /// Mock 응답 등록
+    dioAdapter.onPost(
+      loginPath,
+      (server) => server.reply(
+        200,
+        LoginResponseDtoMock.success().toJson(),
+        delay: const Duration(seconds: 1),
+      ),
+      data: requestData.toJson(),
+    );
+
+    return await super.login(requestData: requestData);
+  }
+}

lib/feature/account/data/data_sources/remote/api.dart

@@ -1,5 +1,17 @@
+import 'dart:async';
+
 import 'package:withu_app/core/core.dart';
+import 'package:withu_app/feature/account/data/data_sources/dto/dto.dart';
 
 abstract class AccountApi extends API {
+  /// API 주소
   final path = "/api/account";
+
+  /// 로그인 주소
+  late final loginPath = '$path/login';
+
+  /// 로그인 API
+  FutureOr<ApiResponse<LoginResponseDto>> login({
+    required LoginRequestDto requestData,
+  });
 }

lib/feature/account/data/data_sources/remote/api_impl.dart

@@ -1,3 +1,22 @@
+import 'dart:async';
+import 'package:withu_app/core/network/api_response.dart';
+import 'package:withu_app/feature/account/data/data_sources/dto/dto.dart';
 import 'api.dart';
 
-class AccountApiImpl extends AccountApi {}
+class AccountApiImpl extends AccountApi {
+  /// 로그인 API
+  @override
+  FutureOr<ApiResponse<LoginResponseDto>> login({
+    required LoginRequestDto requestData,
+  }) async {
+    return dio
+        .post(
+          loginPath,
+          data: requestData.toJson(),
+        )
+        .then((response) => ApiResponse.success(
+              LoginResponseDto.fromJson(response.data),
+            ))
+        .catchError((_) => const ApiResponse<LoginResponseDto>.error());
+  }
+}