feat(ECR-042): OpsCMS FeedSlot 薄写面

Admin POST/PUT 复用 admin.cms.write；C 端 GET /home/feed-slots；首页无 active 槽隐藏推荐区、失败回退展示；无新 migration。

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

apps/user-h5/src/pages/HomePage.vue

@@ -16,7 +16,7 @@
     <div class="sheet reveal" style="--d: 100ms">
       <HomeToolGrid :row1="gridRow1" :row2="gridRow2" @track="trackGrid" />
       <HomePromoSection />
-      <HomeFeedSection :feeds="feeds" />
+      <HomeFeedSection v-if="feedsVisible" :feeds="feeds" />
     </div>
   </main>
 </template>
@@ -38,6 +38,7 @@ const {
   gridRow1,
   gridRow2,
   feeds,
+  feedsVisible,
   goPlus,
   trackGrid,
 } = useHomePage()