테넌트 crud 테스트 코드 추가

backend/internal/repository/tenant_repository.go

@@ -16,6 +16,7 @@ type TenantRepository interface {
 	FindByDomain(ctx context.Context, domainName string) (*domain.Tenant, error)
 	FindByIDs(ctx context.Context, ids []string) ([]domain.Tenant, error)
 	AddDomain(ctx context.Context, tenantID string, domainName string, verified bool) error
+	List(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error)
 }
 
 type tenantRepository struct {
@@ -90,3 +91,23 @@ func (r *tenantRepository) AddDomain(ctx context.Context, tenantID string, domai
 	}
 	return r.db.WithContext(ctx).Create(&td).Error
 }
+
+func (r *tenantRepository) List(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error) {
+	var tenants []domain.Tenant
+	var total int64
+	db := r.db.WithContext(ctx).Model(&domain.Tenant{})
+
+	if parentID != "" {
+		db = db.Where("parent_id = ?", parentID)
+	}
+
+	if err := db.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	if err := db.Order("created_at desc").Limit(limit).Offset(offset).Preload("Domains").Find(&tenants).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return tenants, total, nil
+}