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/yiyan.js

@@ -1,7 +1,7 @@
 /**
  * Bilingual quote switcher, matching the reference theme's local quote file.
  *
- * @package AKSRT
+ * @package Jio
  */
 (function () {
   'use strict';
@@ -16,7 +16,7 @@
       method: 'POST',
       credentials: 'same-origin',
       headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
-      body: 'action=aksrt_yiyan',
+      body: 'action=jio_yiyan',
     })
       .then(function (response) {
         if (!response.ok) throw new Error('HTTP ' + response.status);
@@ -48,8 +48,8 @@
   function init(root) {
     var scope = root || document;
     var elements = [];
-    if (scope.matches && scope.matches('[data-aksrt-yiyan]')) elements.push(scope);
-    if (scope.querySelectorAll) elements = elements.concat(Array.prototype.slice.call(scope.querySelectorAll('[data-aksrt-yiyan]')));
+    if (scope.matches && scope.matches('[data-jio-yiyan]')) elements.push(scope);
+    if (scope.querySelectorAll) elements = elements.concat(Array.prototype.slice.call(scope.querySelectorAll('[data-jio-yiyan]')));
     elements.forEach(function (el) {
       if (el.dataset.yiyanBound) return;
       el.dataset.yiyanBound = '1';
@@ -70,10 +70,10 @@
     });
   }
 
-  window.AksrtYiyan = { init: init };
+  window.JioYiyan = { init: init };
 
   if (window.jQuery) {
-    window.jQuery(document).off('auto_fun.aksrt-yiyan').on('auto_fun.aksrt-yiyan', function () {
+    window.jQuery(document).off('auto_fun.jio-yiyan').on('auto_fun.jio-yiyan', function () {
       init(document);
     });
   }