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/h5-partner/src/pages/ActivityPostersPage.tsx

@@ -0,0 +1,25 @@
+import { useEffect } from 'react';
+import { useNavigate, useSearchParams } from 'react-router-dom';
+import PageHeader from '@dukang/shared-ui/PageHeader';
+import ActivityPosterPicker from '../components/ActivityPosterPicker';
+import { usePartnerPageView } from '../lib/usePageView';
+
+export default function ActivityPostersPage() {
+  usePartnerPageView('partner_activity_posters_view');
+  const navigate = useNavigate();
+  const [searchParams] = useSearchParams();
+  const initialId = searchParams.get('id');
+
+  useEffect(() => {
+    document.title = '活动图';
+  }, []);
+
+  return (
+    <div>
+      <PageHeader title="活动图" onBack={() => navigate(-1)} />
+      <div style={{ padding: 16 }}>
+        <ActivityPosterPicker initialId={initialId} />
+      </div>
+    </div>
+  );
+}