feat: add dataset item images

backend/internal/logic/dataset/service.go

@@ -60,6 +60,7 @@ type ItemInput struct {
 	Summary        string
 	Content        string
 	URL            string
+	ImageURL       string
 	PublishedAt    *time.Time
 }
 
@@ -293,10 +294,15 @@ func (s *Service) CreateItem(userID uint, input ItemInput) (*models.SaDatasetIte
 	if itemURL != "" && !validHTTPURL(itemURL) {
 		return nil, ErrURLInvalid
 	}
+	imageURL := strings.TrimSpace(input.ImageURL)
+	if imageURL != "" && !validHTTPURL(imageURL) {
+		return nil, ErrURLInvalid
+	}
 	item := &models.SaDatasetItem{
 		SourceID: source.ID, Title: title,
 		Summary: strings.TrimSpace(input.Summary), Content: strings.TrimSpace(input.Content),
-		URL: itemURL, Status: "unread", PublishedAt: utcOptionalTime(input.PublishedAt),
+		URL: itemURL, ImageURL: imageURL, Status: "unread",
+		PublishedAt: utcOptionalTime(input.PublishedAt),
 	}
 	return item, s.db.Create(item).Error
 }
@@ -461,7 +467,8 @@ func storeFeedItems(tx *gorm.DB, source models.SaDatasetSource, items []FeedItem
 		item := models.SaDatasetItem{
 			SourceID: source.ID, ExternalID: &externalID,
 			Title: input.Title, Summary: input.Summary, Content: input.Content,
-			URL: input.URL, Status: "unread", PublishedAt: input.PublishedAt,
+			URL: input.URL, ImageURL: input.ImageURL,
+			Status: "unread", PublishedAt: input.PublishedAt,
 		}
 		result := tx.Clauses(clause.OnConflict{
 			Columns:   []clause.Column{{Name: "source_id"}, {Name: "external_id"}},