feat(admin): 商城/论坛/支付/用户导航默认落点与次级概览

按 stream-h 收束后台默认入口：实体与前台结果优先；shop/forum 概览标 secondaryEntry；payment 默认落到付费内容；users 将短信/微信后移。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/src/constants/sections/index.js

@@ -17,7 +17,7 @@ const SECTION_DEFAULT_CHILDREN = {
   'post-list': 'post-list-page',
   permissions: 'permissions-comment',
   users: 'users-auth',
-  payment: 'payment-gateway',
+  payment: 'payment-paid',
   shop: 'shop-products',
   forum: 'forum-boards',
   extensions: 'extensions-ip',