refactor: rename the theme brand and every identifier from AKSRT to Jio

Full-project rename. `git grep -i aksrt` is now empty apart from the
DBMigrator 3.3.0 changelog note that documents the rename itself.

Code identifiers
- PHP namespace AKSRT\ -> Jio\ (composer PSR-4 + 378 declarations)
- global constants AKSRT_* -> JIO_* (VERSION/DIR/URI, PAY_TYPE_*, CAPTCHA_*)
- procedural functions, hooks, options, meta keys, table names,
  cookies, query vars, ajax actions and nonces: aksrt_ -> jio_
- text domain aksrt -> jio; Theme Name -> Jio
- JS globals: aksrtData/aksrtAdminData/... -> jioData/jioAdminData/...,
  window.AKSRTCaptcha & friends -> window.JioCaptcha, Aksrt* -> Jio*
- Vue components Aks*.vue -> Jio*.vue (15 files renamed + imports)
- CSS classes/data-attrs/custom properties: aksrt- -> jio-
- REST namespace aksrt/v1 -> jio/v1 (incl. payment gateway callbacks)

Storage layer
- DB tables {prefix}aksrt_* -> {prefix}jio_*; SCHEMA_VERSION 3.2.0 -> 3.3.0
  so dbDelta creates the new names on install
- widget id_base aksrt_widget_* -> jio_widget_*
- uninstall.php drop list rebuilt from the actual migrator tables
  (dropped 3 stale entries, added the 17 missing ones)

Removed
- hardcoded https://api.aksrt.com/version.json default update endpoint;
  get_endpoint() now reads the 「更新端点」 setting and do_check() no-ops
  when it is empty

Files renamed: inc/helpers/aksrt-*.php -> jio-*.php (54),
assets/admin/src/components/form/Aks*.vue -> Jio*.vue (15).
Build artifacts regenerated: assets/css/build, assets/js/runtime,
assets/admin/build.

Verified: audit-psr4-paths errors=0, audit-admin-contracts errors=0
(warnings=56, unchanged baseline), 813/813 widget-system tests,
44/44 phpunit, php -l clean across all PHP.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/js/admin-vip.js

@@ -1,5 +1,5 @@
 /**
- * 用户会员后台页（users.php?page=aksrt_user_vip）的调整弹窗。
+ * 用户会员后台页（users.php?page=jio_user_vip）的调整弹窗。
  * - 行内「调整」：单人打开弹窗；工具栏「批量调整」：对勾选用户打开弹窗；
  * - 按操作类型切换字段，隐藏区域的输入被禁用，不参与校验与提交；
  * - 单人时按用户状态禁用不可用的操作（延长 / 恢复）；
@@ -9,25 +9,25 @@
 (function () {
   'use strict';
 
-  var dialog = document.getElementById('aksrt-vip-dialog');
+  var dialog = document.getElementById('jio-vip-dialog');
   if (!dialog || typeof dialog.showModal !== 'function') return;
 
   var form = dialog.querySelector('form');
-  var ids = dialog.querySelector('[data-aksrt-vip-ids]');
-  var title = dialog.querySelector('[data-aksrt-vip-title]');
-  var target = dialog.querySelector('[data-aksrt-vip-target]');
-  var opHint = dialog.querySelector('[data-aksrt-vip-op-hint]');
-  var bulkNote = dialog.querySelector('[data-aksrt-vip-bulk-note]');
-  var submit = dialog.querySelector('[data-aksrt-vip-submit]');
-  var permanent = dialog.querySelector('[data-aksrt-vip-permanent]');
-  var dateInput = dialog.querySelector('[data-aksrt-vip-date]');
-  var levelSelect = dialog.querySelector('[data-aksrt-vip-level]');
+  var ids = dialog.querySelector('[data-jio-vip-ids]');
+  var title = dialog.querySelector('[data-jio-vip-title]');
+  var target = dialog.querySelector('[data-jio-vip-target]');
+  var opHint = dialog.querySelector('[data-jio-vip-op-hint]');
+  var bulkNote = dialog.querySelector('[data-jio-vip-bulk-note]');
+  var submit = dialog.querySelector('[data-jio-vip-submit]');
+  var permanent = dialog.querySelector('[data-jio-vip-permanent]');
+  var dateInput = dialog.querySelector('[data-jio-vip-date]');
+  var levelSelect = dialog.querySelector('[data-jio-vip-level]');
   var radios = dialog.querySelectorAll('input[name="vip_operation"]');
-  var panes = dialog.querySelectorAll('[data-aksrt-vip-pane]');
-  var bulkButton = document.querySelector('[data-aksrt-vip-bulk]');
-  var selection = document.querySelector('[data-aksrt-vip-selection]');
-  var checkAll = document.querySelector('[data-aksrt-vip-check-all]');
-  var checks = document.querySelectorAll('.aksrt-vip-check');
+  var panes = dialog.querySelectorAll('[data-jio-vip-pane]');
+  var bulkButton = document.querySelector('[data-jio-vip-bulk]');
+  var selection = document.querySelector('[data-jio-vip-selection]');
+  var checkAll = document.querySelector('[data-jio-vip-check-all]');
+  var checks = document.querySelectorAll('.jio-vip-check');
 
   function t(key, value) {
     var text = dialog.getAttribute('data-i18n-' + key) || '';
@@ -42,7 +42,7 @@
   function sync() {
     var op = operation();
     panes.forEach(function (pane) {
-      var on = pane.getAttribute('data-aksrt-vip-pane') === op;
+      var on = pane.getAttribute('data-jio-vip-pane') === op;
       pane.hidden = !on;
       pane.querySelectorAll('input, select').forEach(function (field) { field.disabled = !on; });
     });
@@ -126,7 +126,7 @@
     }
   }
 
-  document.querySelectorAll('[data-aksrt-vip-edit]').forEach(function (button) {
+  document.querySelectorAll('[data-jio-vip-edit]').forEach(function (button) {
     button.addEventListener('click', function () { open([button], false); });
   });
   if (bulkButton) {
@@ -146,7 +146,7 @@
   radios.forEach(function (radio) { radio.addEventListener('change', sync); });
   if (permanent) permanent.addEventListener('change', sync);
 
-  dialog.querySelectorAll('[data-aksrt-vip-close]').forEach(function (button) {
+  dialog.querySelectorAll('[data-jio-vip-close]').forEach(function (button) {
     button.addEventListener('click', function () { dialog.close(); });
   });
   // 点击遮罩（dialog 自身而非内容区）关闭。