feat: API 인증 시스템 구현 및 로그인 화면 연동

- AuthService, AuthRemoteDataSource 구현
- JWT 토큰 관리 (SecureStorage 사용)
- 로그인 화면 API 연동 및 에러 처리
- freezed 패키지로 Auth 관련 DTO 모델 생성
- 의존성 주입 설정 업데이트

lib/data/models/auth/logout_request.freezed.dart

@@ -0,0 +1,171 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'logout_request.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#adding-getters-and-methods-to-our-models');
+
+LogoutRequest _$LogoutRequestFromJson(Map<String, dynamic> json) {
+  return _LogoutRequest.fromJson(json);
+}
+
+/// @nodoc
+mixin _$LogoutRequest {
+  @JsonKey(name: 'refresh_token')
+  String get refreshToken => throw _privateConstructorUsedError;
+
+  /// Serializes this LogoutRequest to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of LogoutRequest
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $LogoutRequestCopyWith<LogoutRequest> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $LogoutRequestCopyWith<$Res> {
+  factory $LogoutRequestCopyWith(
+          LogoutRequest value, $Res Function(LogoutRequest) then) =
+      _$LogoutRequestCopyWithImpl<$Res, LogoutRequest>;
+  @useResult
+  $Res call({@JsonKey(name: 'refresh_token') String refreshToken});
+}
+
+/// @nodoc
+class _$LogoutRequestCopyWithImpl<$Res, $Val extends LogoutRequest>
+    implements $LogoutRequestCopyWith<$Res> {
+  _$LogoutRequestCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of LogoutRequest
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? refreshToken = null,
+  }) {
+    return _then(_value.copyWith(
+      refreshToken: null == refreshToken
+          ? _value.refreshToken
+          : refreshToken // ignore: cast_nullable_to_non_nullable
+              as String,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$LogoutRequestImplCopyWith<$Res>
+    implements $LogoutRequestCopyWith<$Res> {
+  factory _$$LogoutRequestImplCopyWith(
+          _$LogoutRequestImpl value, $Res Function(_$LogoutRequestImpl) then) =
+      __$$LogoutRequestImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call({@JsonKey(name: 'refresh_token') String refreshToken});
+}
+
+/// @nodoc
+class __$$LogoutRequestImplCopyWithImpl<$Res>
+    extends _$LogoutRequestCopyWithImpl<$Res, _$LogoutRequestImpl>
+    implements _$$LogoutRequestImplCopyWith<$Res> {
+  __$$LogoutRequestImplCopyWithImpl(
+      _$LogoutRequestImpl _value, $Res Function(_$LogoutRequestImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of LogoutRequest
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? refreshToken = null,
+  }) {
+    return _then(_$LogoutRequestImpl(
+      refreshToken: null == refreshToken
+          ? _value.refreshToken
+          : refreshToken // ignore: cast_nullable_to_non_nullable
+              as String,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$LogoutRequestImpl implements _LogoutRequest {
+  const _$LogoutRequestImpl(
+      {@JsonKey(name: 'refresh_token') required this.refreshToken});
+
+  factory _$LogoutRequestImpl.fromJson(Map<String, dynamic> json) =>
+      _$$LogoutRequestImplFromJson(json);
+
+  @override
+  @JsonKey(name: 'refresh_token')
+  final String refreshToken;
+
+  @override
+  String toString() {
+    return 'LogoutRequest(refreshToken: $refreshToken)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$LogoutRequestImpl &&
+            (identical(other.refreshToken, refreshToken) ||
+                other.refreshToken == refreshToken));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, refreshToken);
+
+  /// Create a copy of LogoutRequest
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$LogoutRequestImplCopyWith<_$LogoutRequestImpl> get copyWith =>
+      __$$LogoutRequestImplCopyWithImpl<_$LogoutRequestImpl>(this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$LogoutRequestImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _LogoutRequest implements LogoutRequest {
+  const factory _LogoutRequest(
+      {@JsonKey(name: 'refresh_token')
+      required final String refreshToken}) = _$LogoutRequestImpl;
+
+  factory _LogoutRequest.fromJson(Map<String, dynamic> json) =
+      _$LogoutRequestImpl.fromJson;
+
+  @override
+  @JsonKey(name: 'refresh_token')
+  String get refreshToken;
+
+  /// Create a copy of LogoutRequest
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$LogoutRequestImplCopyWith<_$LogoutRequestImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}