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>

apps/admin-h5/src/api/client.ts

@@ -452,6 +452,51 @@ export const adminApi = {
       system: boolean
       updated_at: string
     }>('GET', `/cms/banners/${id}`),
+  createBanner: (body: {
+    code: string
+    title: string
+    placement: string
+    image_url?: string | null
+    link_path?: string | null
+    sort_order: number
+    active: boolean
+  }) =>
+    request<{
+      id: string
+      code: string
+      title: string
+      placement: string
+      image_url?: string
+      link_path?: string
+      sort_order: number
+      active: boolean
+      system: boolean
+      updated_at: string
+    }>('POST', '/cms/banners', body),
+  updateBanner: (
+    id: string,
+    body: {
+      code: string
+      title: string
+      placement: string
+      image_url?: string | null
+      link_path?: string | null
+      sort_order: number
+      active: boolean
+    },
+  ) =>
+    request<{
+      id: string
+      code: string
+      title: string
+      placement: string
+      image_url?: string
+      link_path?: string
+      sort_order: number
+      active: boolean
+      system: boolean
+      updated_at: string
+    }>('PUT', `/cms/banners/${id}`, body),
   feedSlots: () =>
     request<{
       items: Array<{