[CMS-VISUAL] F3: 首页展示形态唯一入口收敛到布局编辑器——栏目保存缺省 homeStyle 时保留存量值，管理弹窗移除该下拉（19/19 IT 绿）

src/main/java/com/yunhai/cms/service/impl/CategoryService.java

@@ -80,8 +80,7 @@ public class CategoryService {
         if (StringUtils.hasText(req.getHomeStyle()) && !HOME_STYLE_VALUES.contains(req.getHomeStyle())) {
             throw new BizException(ErrorCode.PARAM_ERROR,
                     "首页展示形态非法：" + req.getHomeStyle() + "（仅支持 news_grid / media_focus）");
-        }
-        CmsCategory category;
+        }        CmsCategory category;
         if (req.getId() == null) {
             category = new CmsCategory();
             category.setSiteId(site.getId());
@@ -98,7 +97,9 @@ public class CategoryService {
         category.setType(type.getCode());
         category.setLinkUrl(req.getLinkUrl());
         category.setTemplate(req.getTemplate());
-        category.setHomeStyle(StringUtils.hasText(req.getHomeStyle()) ? req.getHomeStyle() : null);
+        // F3（docs/20 §四）：「首页展示形态」唯一入口收敛到首页布局编辑器，栏目管理不再编辑该字段——
+        // 入参缺省时保留已有值（存量数据不清除，无布局站点的回落渲染仍消费）；显式传值仍校验（API 兼容）
+        category.setHomeStyle(StringUtils.hasText(req.getHomeStyle()) ? req.getHomeStyle() : category.getHomeStyle());
         category.setContent(HtmlSanitizer.clean(req.getContent()));
         category.setSortNo(req.getSortNo() == null ? 0 : req.getSortNo());
         category.setSeoTitle(req.getSeoTitle());