feat(ECR-041): OpsCMS Banner 薄写面（Write-Wave 首刀）

Admin POST/PUT + admin.cms.write/审计；C 端 GET /home/banners；首页投影回退静态 homeFeeds；migration 000051；不碰 FeedSlot/支付/UGC。

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

packages/sdk/src/index.ts

@@ -278,6 +278,19 @@ export function createClient(opts: CreateClientOptions) {
           enabled?: boolean
         }>
       }>('/api/v1/home/tools'),
+    getHomeBanners: (placement = 'home') =>
+      call<{
+        items: Array<{
+          id: string
+          code: string
+          title: string
+          placement: string
+          image_url?: string
+          link_path?: string
+          sort_order: number
+          active: boolean
+        }>
+      }>(`/api/v1/home/banners?placement=${encodeURIComponent(placement)}`),
     getHomeDailyTips: () => call<HomeDailyTips>('/api/v1/home/daily-tips'),
   }
 }