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>

src/Admin/MessageController.php

@@ -1,9 +1,9 @@
 <?php
 /**
- * @package AKSRT
+ * @package Jio
  */
 
-namespace AKSRT\Admin;
+namespace Jio\Admin;
 
 defined('ABSPATH') || exit;
 
@@ -63,11 +63,11 @@ class MessageController extends ControllerBase {
         $per_page = min(100, (int) $request->get_param('per_page'));
         $page     = max(1, (int) $request->get_param('page'));
 
-        if (!class_exists('\AKSRT\Messages\Message')) {
+        if (!class_exists('\Jio\Messages\Message')) {
             return $this->success(['data' => [], 'total' => 0]);
         }
 
-        $msg = \AKSRT\Messages\Message::get_instance();
+        $msg = \Jio\Messages\Message::get_instance();
         $args = [
             'limit'  => $per_page,
             'offset' => ($page - 1) * $per_page,
@@ -87,29 +87,29 @@ class MessageController extends ControllerBase {
 
     public function get_unread_count(\WP_REST_Request $request): \WP_REST_Response {
         $user_id = get_current_user_id();
-        if (!class_exists('\AKSRT\Messages\Message')) {
+        if (!class_exists('\Jio\Messages\Message')) {
             return $this->success(['data' => ['unread' => 0]]);
         }
-        $count = \AKSRT\Messages\Message::get_instance()->get_unread_count($user_id);
+        $count = \Jio\Messages\Message::get_instance()->get_unread_count($user_id);
         return $this->success(['data' => ['unread' => $count]]);
     }
 
     public function mark_read(\WP_REST_Request $request): \WP_REST_Response {
         $user_id = get_current_user_id();
         $id      = (string) $request->get_param('id');
-        if (!class_exists('\AKSRT\Messages\Message')) {
+        if (!class_exists('\Jio\Messages\Message')) {
             return $this->error('not_available', '消息系统未启用。', 501);
         }
-        $result = \AKSRT\Messages\Message::get_instance()->mark_read($user_id, $id);
+        $result = \Jio\Messages\Message::get_instance()->mark_read($user_id, $id);
         return $this->success(['data' => ['success' => $result]]);
     }
 
     public function mark_all_read(\WP_REST_Request $request): \WP_REST_Response {
         $user_id = get_current_user_id();
-        if (!class_exists('\AKSRT\Messages\Message')) {
+        if (!class_exists('\Jio\Messages\Message')) {
             return $this->error('not_available', '消息系统未启用。', 501);
         }
-        $result = \AKSRT\Messages\Message::get_instance()->mark_all_read($user_id);
+        $result = \Jio\Messages\Message::get_instance()->mark_all_read($user_id);
         return $this->success(['data' => ['success' => $result]]);
     }