feat: login api

lib/domain/auth/failures/auth_failure.dart

@@ -0,0 +1,9 @@
+part of '../auth.dart';
+
+@freezed
+sealed class AuthFailure with _$AuthFailure {
+  const factory AuthFailure.serverError(ApiFailure failure) = _ServerError;
+  const factory AuthFailure.unexpectedError() = _UnexpectedError;
+  const factory AuthFailure.dynamicErrorMessage(String erroMessage) =
+      _DynamicErrorMessage;
+}