feat(listings): 详情页价格拆分收敛为一行展示

backend/internal/modules/listing/presenter.go

@@ -78,12 +78,28 @@ func applyPublicListingURLs(item *ListingDTO) {
 	rawScreenshotURLs := item.ScreenshotURLS
 	item.ScreenshotURLS = publicScreenshotURLs(item.ID, item.ScreenshotURLS, item.Status, item.ReviewStatus)
 	if item.AssetSummary != nil {
+		applyPublicPriceBreakdown(item.AssetSummary)
 		delete(item.AssetSummary, "import_meta")
 		delete(item.AssetSummary, "price_breakdown")
 		applyPublicScreenshotGroups(item.ID, item.AssetSummary, rawScreenshotURLs, item.ScreenshotURLS)
 	}
 }
 
+// applyPublicPriceBreakdown 把买家侧的纯币租金和额外物资摊平到资产摘要顶层。
+// 公共接口随后会删除完整的 price_breakdown，避免暴露卖家成本和平台加价。
+func applyPublicPriceBreakdown(summary map[string]any) {
+	breakdown, ok := summary["price_breakdown"].(map[string]any)
+	if !ok {
+		return
+	}
+	if pureCoinCent := summaryMoneyCent(breakdown, "buyer_coin_base_price_cent", "buyer_coin_base_price"); pureCoinCent > 0 {
+		summary["pure_coin_price_cent"] = pureCoinCent
+	}
+	if extraItemCent := summaryMoneyCent(breakdown, "consumable_price_cent", "consumable_price"); extraItemCent > 0 {
+		summary["extra_item_price_cent"] = extraItemCent
+	}
+}
+
 func applyPublicScreenshotGroups(listingID uint64, assetSummary map[string]any, rawURLs []string, publicURLs []string) {
 	rawGroups, ok := assetSummary["screenshot_groups"].(map[string]any)
 	if !ok {