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>

404.php

@@ -2,15 +2,15 @@
 /**
  * 404 template.
  *
- * @package AKSRT
+ * @package Jio
  */
 
 defined('ABSPATH') || exit;
 
 get_header();
 
-$search_placeholder = function_exists('aksrt_get_search_placeholder') ? aksrt_get_search_placeholder() : __('开启精彩搜索', 'aksrt');
-$hot_keywords = function_exists('aksrt_get_search_hot_keywords') ? aksrt_get_search_hot_keywords() : [];
+$search_placeholder = function_exists('jio_get_search_placeholder') ? jio_get_search_placeholder() : __('开启精彩搜索', 'jio');
+$hot_keywords = function_exists('jio_get_search_hot_keywords') ? jio_get_search_hot_keywords() : [];
 
 $hot_query = new WP_Query([
 	'post_type'           => 'post',
@@ -39,33 +39,33 @@ $top_cats = get_terms([
 					<i class="fa fas fa-compass"></i>
 				</p>
 				<p class="error-hero__code" id="error-title">404</p>
-				<h1 class="error-hero__title"><?php esc_html_e('页面未找到', 'aksrt'); ?></h1>
+				<h1 class="error-hero__title"><?php esc_html_e('页面未找到', 'jio'); ?></h1>
 				<p class="error-hero__desc">
-					<?php esc_html_e('你访问的页面不存在或已被删除。试试搜索，或者从下方常用入口继续浏览。', 'aksrt'); ?>
+					<?php esc_html_e('你访问的页面不存在或已被删除。试试搜索，或者从下方常用入口继续浏览。', 'jio'); ?>
 				</p>
 			</div>
-			<?php if (function_exists('aksrt_render_admin_quick_link')) { aksrt_render_admin_quick_link('page-display/other', __('404 页设置', 'aksrt')); } ?>
+			<?php if (function_exists('jio_render_admin_quick_link')) { jio_render_admin_quick_link('page-display/other', __('404 页设置', 'jio')); } ?>
 		</div>
 
 		<form role="search" method="get" class="error-hero__search" action="<?php echo esc_url(home_url('/')); ?>">
 			<span class="error-hero__search-icon" aria-hidden="true">
 				<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.3-4.3"/></svg>
 			</span>
-			<label class="screen-reader-text" for="error-search-input"><?php esc_html_e('搜索', 'aksrt'); ?></label>
+			<label class="screen-reader-text" for="error-search-input"><?php esc_html_e('搜索', 'jio'); ?></label>
 			<input type="search" id="error-search-input" name="s" placeholder="<?php echo esc_attr($search_placeholder); ?>" autocomplete="off">
-			<button type="submit" class="btn-primary btn-sm"><?php esc_html_e('搜索', 'aksrt'); ?></button>
+			<button type="submit" class="btn-primary btn-sm"><?php esc_html_e('搜索', 'jio'); ?></button>
 		</form>
-		<?php aksrt_render_search_hot_keywords($hot_keywords, 'aksrt-search-hot-keywords'); ?>
+		<?php jio_render_search_hot_keywords($hot_keywords, 'jio-search-hot-keywords'); ?>
 
 		<div class="error-hero__actions">
-			<a href="<?php echo esc_url(home_url('/')); ?>" class="btn-primary"><?php esc_html_e('返回首页', 'aksrt'); ?></a>
-			<a href="javascript:history.back()" class="btn-outline"><?php esc_html_e('返回上一页', 'aksrt'); ?></a>
+			<a href="<?php echo esc_url(home_url('/')); ?>" class="btn-primary"><?php esc_html_e('返回首页', 'jio'); ?></a>
+			<a href="javascript:history.back()" class="btn-outline"><?php esc_html_e('返回上一页', 'jio'); ?></a>
 		</div>
 	</section>
 
 	<?php if (!empty($top_cats) && !is_wp_error($top_cats)) : ?>
-		<section class="error-section" aria-label="<?php esc_attr_e('热门分类', 'aksrt'); ?>">
-			<h2 class="error-section__title"><?php esc_html_e('热门分类', 'aksrt'); ?></h2>
+		<section class="error-section" aria-label="<?php esc_attr_e('热门分类', 'jio'); ?>">
+			<h2 class="error-section__title"><?php esc_html_e('热门分类', 'jio'); ?></h2>
 			<div class="error-section__chips">
 				<?php foreach ($top_cats as $cat) : ?>
 					<a class="error-section__chip" href="<?php echo esc_url(get_category_link($cat->term_id)); ?>">
@@ -78,8 +78,8 @@ $top_cats = get_terms([
 	<?php endif; ?>
 
 	<?php if ($hot_query->have_posts()) : ?>
-		<section class="error-section" aria-label="<?php esc_attr_e('热门内容', 'aksrt'); ?>">
-			<h2 class="error-section__title"><?php esc_html_e('热门内容', 'aksrt'); ?></h2>
+		<section class="error-section" aria-label="<?php esc_attr_e('热门内容', 'jio'); ?>">
+			<h2 class="error-section__title"><?php esc_html_e('热门内容', 'jio'); ?></h2>
 			<ul class="error-section__list">
 				<?php while ($hot_query->have_posts()) : $hot_query->the_post(); ?>
 					<li>