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/parts/docs/doc-chapter-nav.php

@@ -3,16 +3,16 @@
  * Document Chapter Navigation
  *
  * Shows previous/next chapter navigation at the bottom of a document page.
- * Uses \AKSRT\Core\DocsPresenter for chapter resolution.
+ * Uses \Jio\Core\DocsPresenter for chapter resolution.
  *
- * @package AKSRT
+ * @package Jio
  */
 
 defined('ABSPATH') || exit;
 
 $current_id = get_the_ID();
 
-$presenter = class_exists('\AKSRT\Core\DocsPresenter') ? \AKSRT\Core\DocsPresenter::get_instance() : null;
+$presenter = class_exists('\Jio\Core\DocsPresenter') ? \Jio\Core\DocsPresenter::get_instance() : null;
 
 if ($presenter) {
     $nav = $presenter->get_chapter_nav($current_id);
@@ -43,28 +43,28 @@ if ($presenter) {
 
 if (!$prev_page && !$next_page) return;
 ?>
-<nav class="aksrt-doc-chapter-nav" aria-label="<?php esc_attr_e('章节导航', 'aksrt'); ?>">
+<nav class="jio-doc-chapter-nav" aria-label="<?php esc_attr_e('章节导航', 'jio'); ?>">
     <?php if ($prev_page) : ?>
-        <a href="<?php echo esc_url(get_permalink($prev_page->ID)); ?>" class="aksrt-doc-chapter-nav__prev">
-            <span class="aksrt-doc-chapter-nav__label">
+        <a href="<?php echo esc_url(get_permalink($prev_page->ID)); ?>" class="jio-doc-chapter-nav__prev">
+            <span class="jio-doc-chapter-nav__label">
                 <i class="fa fas fa-arrow-left"></i>
-                <?php esc_html_e('上一篇', 'aksrt'); ?>
+                <?php esc_html_e('上一篇', 'jio'); ?>
             </span>
-            <span class="aksrt-doc-chapter-nav__title"><?php echo esc_html($prev_page->post_title); ?></span>
+            <span class="jio-doc-chapter-nav__title"><?php echo esc_html($prev_page->post_title); ?></span>
         </a>
     <?php else : ?>
-        <div class="aksrt-doc-chapter-nav__prev aksrt-doc-chapter-nav__prev--disabled"></div>
+        <div class="jio-doc-chapter-nav__prev jio-doc-chapter-nav__prev--disabled"></div>
     <?php endif; ?>
 
     <?php if ($next_page) : ?>
-        <a href="<?php echo esc_url(get_permalink($next_page->ID)); ?>" class="aksrt-doc-chapter-nav__next">
-            <span class="aksrt-doc-chapter-nav__label">
-                <?php esc_html_e('下一篇', 'aksrt'); ?>
+        <a href="<?php echo esc_url(get_permalink($next_page->ID)); ?>" class="jio-doc-chapter-nav__next">
+            <span class="jio-doc-chapter-nav__label">
+                <?php esc_html_e('下一篇', 'jio'); ?>
                 <i class="fa fas fa-arrow-right"></i>
             </span>
-            <span class="aksrt-doc-chapter-nav__title"><?php echo esc_html($next_page->post_title); ?></span>
+            <span class="jio-doc-chapter-nav__title"><?php echo esc_html($next_page->post_title); ?></span>
         </a>
     <?php else : ?>
-        <div class="aksrt-doc-chapter-nav__next aksrt-doc-chapter-nav__next--disabled"></div>
+        <div class="jio-doc-chapter-nav__next jio-doc-chapter-nav__next--disabled"></div>
     <?php endif; ?>
 </nav>