fix(distribution): 分站首页轮播不再叠压暗遮罩

海报已含文案，再叠标题会触发整幅渐变遮罩，把左右两侧颜色压暗。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/features/listings/views/HomeView.vue

@@ -60,14 +60,27 @@ const displayAnnouncements = computed(() => {
 const banners = ref<HomeBannerSlide[]>(defaultHomeBanners)
 const displayBanners = computed<HomeBannerSlide[]>(() => {
   if (siteStore.isDistribution && siteStore.banners && siteStore.banners.length > 0) {
-    return siteStore.banners.map(b => ({
-      eyebrow: siteStore.siteName,
-      title: b.title || '精选游戏账号 · 随租随玩',
-      badge: '本店精选',
-      pill: '官方保障',
-      tone: 'gold',
-      image_url: b.image_url,
-    }))
+    return siteStore.banners.map(b => {
+      const imageUrl = b.image_url?.trim() || ''
+      // 整张海报已含文案。再叠标题会触发整幅压暗遮罩，左右两侧颜色会被压暗。
+      if (imageUrl) {
+        return {
+          eyebrow: '',
+          title: '',
+          badge: '本店精选',
+          pill: '',
+          tone: 'gold',
+          image_url: imageUrl,
+        }
+      }
+      return {
+        eyebrow: siteStore.siteName,
+        title: b.title || '精选游戏账号 · 随租随玩',
+        badge: '本店精选',
+        pill: '官方保障',
+        tone: 'gold',
+      }
+    })
   }
   return banners.value
 })