refactor: remove forum and topic feature chains

assets/admin/src/constants/sections/page-display.js

@@ -106,16 +106,6 @@ export const pageDisplaySection = {
       canonicalDomain: 'page_display',
       section: 'tag',
     }),
-    schemaPage({
-      key: 'page-display-special',
-      name: 'PageDisplaySpecial',
-      label: '专题页面',
-      route: '/page-display/special',
-      title: '专题页面',
-      desc: '配置专题聚合页的封面、摘要、布局、聚合规则和子页面展示策略。',
-      canonicalDomain: 'page_display',
-      section: 'special',
-    }),
     schemaPage({
       key: 'page-display-user-home',
       name: 'PageDisplayUserHome',