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>

templates/pages/page-friends.php

@@ -3,17 +3,17 @@
  * Template Name: 友情链接
  * Template Post Type: page
  *
- * @package AKSRT
+ * @package Jio
  */
 
 defined('ABSPATH') || exit;
 
 get_header();
 
-$links = function_exists('aksrt_get_friend_links') ? aksrt_get_friend_links() : [];
+$links = function_exists('jio_get_friend_links') ? jio_get_friend_links() : [];
 
-if (function_exists('aksrt_archive_open_shell')) {
-	aksrt_archive_open_shell([
+if (function_exists('jio_archive_open_shell')) {
+	jio_archive_open_shell([
 		'main_class'  => 'site-main container page-content-default',
 		'has_sidebar' => false,
 		'page_kind'   => 'friends',
@@ -23,8 +23,8 @@ if (function_exists('aksrt_archive_open_shell')) {
 					<div class="content-main content-main--page content-main--friends">
 						<?php
 						get_template_part('templates/parts/page-header', null, [
-							'title' => esc_html__('友情链接', 'aksrt'),
-							'desc'  => __('与这些优秀的站点交换友链', 'aksrt'),
+							'title' => esc_html__('友情链接', 'jio'),
+							'desc'  => __('与这些优秀的站点交换友链', 'jio'),
 						]);
 						?>
 
@@ -50,17 +50,17 @@ if (function_exists('aksrt_archive_open_shell')) {
 							</div>
 						<?php else : ?>
 							<div class="no-results content-stream__empty">
-								<p><?php esc_html_e('暂无友链，请在主题后台添加。', 'aksrt'); ?></p>
+								<p><?php esc_html_e('暂无友链，请在主题后台添加。', 'jio'); ?></p>
 							</div>
 						<?php endif; ?>
 
 						<p class="text-center" style="margin-top:32px;">
-							<a class="btn-outline" href="<?php echo esc_url(home_url('/')); ?>"><?php esc_html_e('返回首页', 'aksrt'); ?></a>
+							<a class="btn-outline" href="<?php echo esc_url(home_url('/')); ?>"><?php esc_html_e('返回首页', 'jio'); ?></a>
 						</p>
 					</div>
 <?php
-if (function_exists('aksrt_archive_close_shell')) {
-	aksrt_archive_close_shell(['has_sidebar' => false]);
+if (function_exists('jio_archive_close_shell')) {
+	jio_archive_close_shell(['has_sidebar' => false]);
 }
 
 get_footer();