feat(user-center): 用户中心前台 1:1 列表/URL/关注/身份

补齐 orders/cart/revenue/messages 页面 URL helper，修复私有中心商务与消息死链，公共主页商品/关注接入真实数据，开启身份 chips governance，并注册消息中心页面模板。

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

inc/classes/class-aksrt-templates.php

@@ -48,6 +48,7 @@ class AKSRT_Templates {
             'templates/pages/page-orders.php' => __('AKSRT - 订单中心', 'aksrt'),
             'templates/pages/page-revenue.php' => __('AKSRT - 收益中心', 'aksrt'),
             'templates/pages/page-cart.php' => __('AKSRT - 购物车', 'aksrt'),
+            'templates/pages/page-messages.php' => __('AKSRT - 消息中心', 'aksrt'),
             'templates/pages/page-product.php' => __('AKSRT - 商品详情', 'aksrt'),
             'templates/pages/page-product-edit.php' => __('AKSRT - 商品编辑', 'aksrt'),
             'templates/pages/page-forums.php' => __('AKSRT - 论坛', 'aksrt'),