perf(listings): 优化详情页图片加载链路支持公开变体与分级秒开

backend/internal/modules/listing/presenter.go

@@ -65,15 +65,71 @@ func sellerListings(items []ListingDTO) []ListingDTO {
 }
 
 func applyPublicListingURLs(item *ListingDTO) {
+	if item == nil {
+		return
+	}
 	item.SourceChannel = ""
 	item.IsExternalUpload = false
+	rawScreenshotURLs := item.ScreenshotURLS
 	item.ScreenshotURLS = publicScreenshotURLs(item.ID, item.ScreenshotURLS, item.Status, item.ReviewStatus)
 	if item.AssetSummary != nil {
 		delete(item.AssetSummary, "import_meta")
 		delete(item.AssetSummary, "price_breakdown")
+		applyPublicScreenshotGroups(item.ID, item.AssetSummary, rawScreenshotURLs, item.ScreenshotURLS)
 	}
 }
 
+func applyPublicScreenshotGroups(listingID uint64, assetSummary map[string]any, rawURLs []string, publicURLs []string) {
+	rawGroups, ok := assetSummary["screenshot_groups"].(map[string]any)
+	if !ok {
+		return
+	}
+	urlMap := make(map[string]string, len(rawURLs))
+	keyMap := make(map[string]string, len(rawURLs))
+	for i, rawURL := range rawURLs {
+		if i < len(publicURLs) {
+			urlMap[rawURL] = publicURLs[i]
+			if key := extractListingObjectKey(rawURL); key != "" {
+				keyMap[key] = publicURLs[i]
+			}
+		}
+	}
+	newGroups := make(map[string]any, len(rawGroups))
+	for groupKey, groupVal := range rawGroups {
+		switch list := groupVal.(type) {
+		case []string:
+			converted := make([]string, len(list))
+			for i, u := range list {
+				if pub, found := urlMap[u]; found {
+					converted[i] = pub
+				} else if key := extractListingObjectKey(u); key != "" && keyMap[key] != "" {
+					converted[i] = keyMap[key]
+				} else {
+					converted[i] = u
+				}
+			}
+			newGroups[groupKey] = converted
+		case []any:
+			converted := make([]string, len(list))
+			for i, v := range list {
+				if s, ok := v.(string); ok {
+					if pub, found := urlMap[s]; found {
+						converted[i] = pub
+					} else if key := extractListingObjectKey(s); key != "" && keyMap[key] != "" {
+						converted[i] = keyMap[key]
+					} else {
+						converted[i] = s
+					}
+				}
+			}
+			newGroups[groupKey] = converted
+		default:
+			newGroups[groupKey] = groupVal
+		}
+	}
+	assetSummary["screenshot_groups"] = newGroups
+}
+
 func applySellerListingPrice(item *ListingDTO) {
 	if item == nil {
 		return