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>

tests/widget-system/message-center-pagination-harness.php

@@ -22,7 +22,7 @@ namespace {
 	function get_date_from_gmt($date, $format): string { return (string) $date; }
 	function add_action($hook, $callback): void {}
 
-	function aksrt_get_user_all_notifications(int $user_id): array {
+	function jio_get_user_all_notifications(int $user_id): array {
 		$items = [];
 		for ($number = 45; $number >= 1; $number--) {
 			$items[] = [
@@ -39,7 +39,7 @@ namespace {
 	}
 }
 
-namespace AKSRT\Settings {
+namespace Jio\Settings {
 	final class Settings {
 		public static string $paginateType = 'ajax_lists';
 
@@ -53,9 +53,9 @@ namespace {
 	require_once dirname(__DIR__, 2) . '/inc/modules/message-center.php';
 
 	function render_pagination_mode(string $type): string {
-		\AKSRT\Settings\Settings::$paginateType = $type;
+		\Jio\Settings\Settings::$paginateType = $type;
 		ob_start();
-		aksrt_render_message_center_list(1, 'unread', 2);
+		jio_render_message_center_list(1, 'unread', 2);
 		return (string) ob_get_clean();
 	}