feat(ops): v4.0.2 活动图模板、合伙人选择持久化与用户管理主图

HQ 上传底图与码栏；合伙人单选写入 partner_account.activity_poster_id，用户管理下次登录仍显示同一张图。

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

apps/admin-web/src/App.tsx

@@ -25,6 +25,7 @@ import FulfillmentProvidersPage from './pages/FulfillmentProvidersPage';
 import StoreMediaPage from './pages/StoreMediaPage';
 import StoreCategoriesPage from './pages/StoreCategoriesPage';
 import PromoCodesPage from './pages/PromoCodesPage';
+import ActivityPostersPage from './pages/ActivityPostersPage';
 import PromoCodeDetailLayout from './pages/promo/PromoCodeDetailLayout';
 import PromoCodeDetailPage from './pages/promo/PromoCodeDetailPage';
 import PromoCodeUsersPage from './pages/promo/PromoCodeUsersPage';
@@ -86,6 +87,7 @@ export default function App() {
         <Route path="/wechat-bindings" element={<WechatBindingsPage />} />
         <Route path="/orders" element={<OrdersPage />} />
         <Route path="/promo-codes" element={<PromoCodesPage />} />
+        <Route path="/activity-posters" element={<ActivityPostersPage />} />
         <Route path="/promo-codes/:id" element={<PromoCodeDetailLayout />}>
           <Route index element={<PromoCodeDetailPage />} />
           <Route path="users" element={<PromoCodeUsersPage />} />