fix: define missing sortOptions in page-display schema

Homepage schema referenced an undeclared sortOptions constant, which
threw ReferenceError during admin SPA router init and blanked the panel.
Define the options list in sync with homepage_allowed_sorts().

assets/admin/src/schema/sections/page-display/index.js

@@ -3,6 +3,18 @@
  * Each key corresponds to a sub-page under the "页面&显示" section.
  */
 
+/** Homepage sort options — keep in sync with AKSRT_Settings_Home_Cms::homepage_allowed_sorts() */
+const sortOptions = [
+  { label: '最近更新', value: 'modified' },
+  { label: '发布时间', value: 'date' },
+  { label: '浏览量', value: 'views' },
+  { label: '点赞数', value: 'likes' },
+  { label: '评论数', value: 'comments' },
+  { label: '收藏数', value: 'favorites' },
+  { label: '下载量', value: 'downloads' },
+  { label: '随机', value: 'rand' },
+]
+
 export const pageDisplaySchemas = {
   /**
    * Header navigation settings