[CMS-VISUAL] F2: 门户布局区块输出稳定 id + data-plb-id 锚点（display:contents 零布局影响）+ postMessage 预览监听脚本（门户侧 50 测试绿）

src/main/resources/templates/themes/campus-glow/home.html

@@ -30,7 +30,9 @@
          注意坑④：th:replace（优先级 100）先于 th:case（300）执行——case 必须放父元素、replace 放子元素。 -->
     <th:block th:if="${layoutBlocks != null}">
         <th:block th:replace="~{'themes/common/fragments/home-blocks' :: style}" />
+        <th:block th:replace="~{'themes/common/fragments/home-blocks' :: previewScript}" />
         <th:block th:each="block : ${layoutBlocks}">
+            <div class="plb-anchor" th:attr="data-plb-id=${block['id']}" style="display:contents">
             <th:block th:switch="${block.type}">
                 <th:block th:case="'article_list'">
                     <th:block th:switch="${block.homeStyle}">
@@ -48,6 +50,7 @@
                 <th:block th:case="'notice_bar'"><th:block th:replace="~{${themeBase} + '/fragments/home-blocks' :: notice_bar(${block})}" /></th:block>
                 <th:block th:case="*"><th:block th:replace="~{'themes/common/fragments/home-blocks' :: render(${block})}" /></th:block>
             </th:block>
+            </div>
         </th:block>
     </th:block>