린트 적용

backend/internal/handler/auth_handler_async_test.go

@@ -171,6 +171,7 @@ func (m *AsyncMockTenantService) ListTenants(ctx context.Context, limit, offset
 func (m *AsyncMockTenantService) ListManageableTenants(ctx context.Context, userID string) ([]domain.Tenant, error) {
 	return nil, nil
 }
+
 func (m *AsyncMockTenantService) IsDomainAllowed(ctx context.Context, domainName string) (bool, error) {
 	return false, nil
 }