feat(admin): complete native pay ops lists and users.php governance menus

Phase 2b fills shipping, after-sale, coupons, income, and rebate PHP admin
pages under 支付中心, reusing domain services. Phase 3 adds zibll-style
users.php submenus for messages, invite codes, identity verify, and
report/ban queues with admin notices for pending work.

functions.php

@@ -327,6 +327,11 @@ if (is_admin() && class_exists('AKSRT_Admin_Pay_Menus')) {
     AKSRT_Admin_Pay_Menus::get_instance()->init();
 }
 
+// WordPress 原生用户菜单：消息/邀请码/认证/禁封（zibll users.php 子菜单对齐）
+if (is_admin() && class_exists('AKSRT_Admin_Users_Menus')) {
+    AKSRT_Admin_Users_Menus::get_instance()->init();
+}
+
 // ============================================================
 // 主题删除时的数据库清理（仅在用户启用清理选项时生效）
 // uninstall.php 会检查 aksrt_cleanup_on_uninstall 选项