feat(distribution): 分站首页改为联名标题并同步手机轮播

首页主标题显示为站名×大锤商行，手机端使用与电脑端相同的分站自定义海报。

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

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

@@ -40,7 +40,7 @@ import HomeBanner from '../components/HomeBanner.vue'
 import HomeFilters from '../components/HomeFilters.vue'
 import HomeZones from '../components/HomeZones.vue'
 import ListingCard from '../components/ListingCard.vue'
-import { useDistributionSiteStore } from '@/stores/distributionSite'
+import { mapDistributionHomeBanners, useDistributionSiteStore } from '@/stores/distributionSite'
 
 const siteStore = useDistributionSiteStore()
 
@@ -59,28 +59,8 @@ 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 => {
-      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',
-      }
-    })
+  if (siteStore.isDistribution && siteStore.banners.length > 0) {
+    return mapDistributionHomeBanners(siteStore.banners, siteStore.siteName)
   }
   return banners.value
 })
@@ -461,7 +441,7 @@ if (!restored) {
             <span class="dist-pulse"></span>
             {{ siteStore.storefrontText.hero_badge }}
           </div>
-          <h2 class="dist-portal-title">{{ siteStore.siteName }}</h2>
+          <h2 class="dist-portal-title">{{ siteStore.coBrandName }}</h2>
           <p class="dist-portal-desc">{{ siteStore.storefrontText.hero_desc }}</p>
         </div>
         <div class="dist-portal-badges">