feat: 完成 #38 营销图CRUD接口下载校验与测试

internal/marketing/repository/template_repo.go

@@ -70,10 +70,10 @@ func (r *TemplateRepository) FindByID(id uint) (*model.MarketingTemplate, error)
 }
 
 type TemplateListParams struct {
-	CategoryID uint
+	CategoryID  uint
 	OnlyEnabled bool
-	Page       int
-	PageSize   int
+	Page        int
+	PageSize    int
 }
 
 func (r *TemplateRepository) FindList(params TemplateListParams) ([]model.MarketingTemplate, int64, error) {
@@ -116,5 +116,8 @@ func (r *TemplateRepository) IncrementDownloadCount(id uint) error {
 	if tx.Error != nil {
 		return fmt.Errorf("increment download count: %w", tx.Error)
 	}
+	if tx.RowsAffected == 0 {
+		return ErrTemplateNotFound
+	}
 	return nil
 }