조직도 기능 추가

backend/internal/service/user_group_service_test.go

@@ -170,6 +170,10 @@ func (m *MockTenantRepository) AddDomain(ctx context.Context, tenantID string, d
 	return nil
 }
 
+func (m *MockTenantRepository) DeleteBulk(ctx context.Context, ids []string) error {
+	return nil
+}
+
 func TestUserGroupService_Create(t *testing.T) {
 	mockRepo := new(MockUserGroupRepository)
 	mockTenantRepo := new(MockTenantRepository)