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/Core/PostsNavs.php

@@ -2,10 +2,10 @@
 /**
  * 文章导航页设置 AJAX（legacy action/post_navs.php parity）.
  *
- * @package AKSRT
+ * @package Jio
  */
 
-namespace AKSRT\Core;
+namespace Jio\Core;
 
 defined('ABSPATH') || exit;
 
@@ -21,7 +21,7 @@ class PostsNavs {
 	}
 
 	public function init(): void {
-		add_action('wp_ajax_aksrt_post_navs_settings', [$this, 'ajax_save_settings']);
+		add_action('wp_ajax_jio_post_navs_settings', [$this, 'ajax_save_settings']);
 	}
 
 	/**
@@ -29,15 +29,15 @@ class PostsNavs {
 	 */
 	public function ajax_save_settings(): void {
 		if (!current_user_can('manage_options')) {
-			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('权限不足', 'aksrt')]);
+			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('权限不足', 'jio')]);
 		}
-		if (!check_ajax_referer('aksrt_post_navs_settings', '_wpnonce', false)) {
-			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('安全校验失败', 'aksrt')]);
+		if (!check_ajax_referer('jio_post_navs_settings', '_wpnonce', false)) {
+			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('安全校验失败', 'jio')]);
 		}
 
 		$page_id = isset($_POST['page_id']) ? absint($_POST['page_id']) : 0;
 		if ($page_id <= 0 || get_post_type($page_id) !== 'page') {
-			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('无效页面', 'aksrt')]);
+			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('无效页面', 'jio')]);
 		}
 
 		$cat_ids = [];
@@ -56,7 +56,7 @@ class PostsNavs {
 		}
 
 		if (empty($cat_ids)) {
-			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('请选择需要显示的分类', 'aksrt')]);
+			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('请选择需要显示的分类', 'jio')]);
 		}
 
 		if (isset($_POST['navs_page_name'])) {
@@ -69,7 +69,7 @@ class PostsNavs {
 
 		wp_send_json([
 			'error' => 0,
-			'msg'   => __('保存成功', 'aksrt'),
+			'msg'   => __('保存成功', 'jio'),
 			'reload'=> true,
 			'ids'   => $cat_ids,
 		]);