perf(listings): 首页仅展示单张纯币截图，去除悬停轮播以降低OSS并发请求

frontend/src/shared/utils/listingDisplay.ts

@@ -409,3 +409,18 @@ export function isTopTierInsurance(value: string | undefined | null): boolean {
     s.includes('3*3') || s.includes('3x3') || s.includes('3×3') || s === '9格' || s.includes('9格')
   )
 }
+
+/**
+ * 获取账号封面/纯币截图（仅展示一张，优先纯币截图，其次封面图，其次首张截图）
+ */
+export function getCoinScreenshotURL(item: Listing): string {
+  const groups = item.asset_summary?.screenshot_groups
+  if (typeof groups === 'object' && groups !== null) {
+    const coinUrls = (groups as Record<string, unknown>)['coin']
+    if (Array.isArray(coinUrls)) {
+      const firstCoin = coinUrls.find(url => typeof url === 'string' && Boolean(url))
+      if (firstCoin) return firstCoin
+    }
+  }
+  return item.cover_url || item.screenshot_urls?.[0] || ''
+}