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/poster-share.js

@@ -1,7 +1,7 @@
 /**
  * Reference-theme poster sharing runtime.
  *
- * @package AKSRT
+ * @package Jio
  */
 (function (window, document, $) {
   'use strict';
@@ -15,11 +15,11 @@
   }
 
   function ajaxUrl() {
-    return (window.aksrtData && window.aksrtData.ajaxUrl) || (window._win && window._win.ajax_url) || '';
+    return (window.jioData && window.jioData.ajaxUrl) || (window._win && window._win.ajax_url) || '';
   }
 
   function nonce() {
-    return (window.aksrtData && window.aksrtData.nonce) || '';
+    return (window.jioData && window.jioData.nonce) || '';
   }
 
   function loadImage(sources) {
@@ -163,7 +163,7 @@
   function requestPoster($trigger, postId, $modal) {
     $.ajax({
       type: 'POST', url: ajaxUrl(), dataType: 'json',
-      data: { action: 'aksrt_poster_share_data', id: postId, nonce: nonce() }
+      data: { action: 'jio_poster_share_data', id: postId, nonce: nonce() }
     }).done(function (response) {
       if (!response || !response.success || !response.data) {
         notice((response && response.data && response.data.message) || '海报数据加载失败', 'danger');
@@ -183,7 +183,7 @@
     }).always(function () { $trigger.removeAttr('disabled'); });
   }
 
-  $('body').off('click.aksrtPosterShare', '[poster-share]').on('click.aksrtPosterShare', '[poster-share]', function (event) {
+  $('body').off('click.jioPosterShare', '[poster-share]').on('click.jioPosterShare', '[poster-share]', function (event) {
     event.preventDefault();
     var $trigger = $(this);
     var postId = parseInt($trigger.attr('poster-share'), 10) || 0;