dev 브런치 병합 code-check 오류 수정

backend/internal/service/user_group_service.go

@@ -260,7 +260,7 @@ func (s *userGroupService) AddMember(ctx context.Context, groupID, userID string
 			Subject:   "User:" + userID,
 			Action:    domain.KetoOutboxActionCreate,
 		})
-		
+
 		// Also add direct Tenant membership to Keto for member counting
 		_ = s.outboxRepo.Create(ctx, &domain.KetoOutbox{
 			Namespace: "Tenant",