feat: 支持从失败状态重新发起退款，添加相关逻辑和测试用例

backend/app/services/content_test.go

@@ -220,6 +220,14 @@ func (s *ContentTestSuite) Test_AttachAsset() {
 			So(appErr.Code, ShouldEqual, errorx.ErrPreconditionFailed.Code)
 		})
 
+		Convey("preview role 绑定 main variant 应被拒绝", func() {
+			_, err := Content.AttachAsset(ctx, tenantID, userID, content.ID, asset.ID, consts.ContentAssetRolePreview, 1, now)
+			So(err, ShouldNotBeNil)
+			var appErr *errorx.AppError
+			So(errors.As(err, &appErr), ShouldBeTrue)
+			So(appErr.Code, ShouldEqual, errorx.ErrPreconditionFailed.Code)
+		})
+
 		Convey("main role 绑定 preview variant 应被拒绝", func() {
 			previewAsset := &models.MediaAsset{
 				TenantID:  tenantID,