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/admin/wechat-settings-harness.php

@@ -42,7 +42,7 @@ namespace {
 	function get_option($k, $default = false) { return $GLOBALS['wechat_options'][$k] ?? $default; }
 	function update_option($k, $v) { $GLOBALS['wechat_options'][$k] = $v; return true; }
 
-	$GLOBALS['wechat_options'] = ['aksrt_wechat_settings' => [
+	$GLOBALS['wechat_options'] = ['jio_wechat_settings' => [
 		'enabled'     => true,
 		'app_id'      => 'wxAPPID',
 		'app_secret'  => 'SECRET123',
@@ -56,7 +56,7 @@ namespace {
 	};
 }
 
-namespace AKSRT\Settings {
+namespace Jio\Settings {
 	// Settings 层仅为薄委托，harness 直接对接真实 Integration。
 	class Settings {
 		public static function get_wechat_settings(): array { return Integration::get_wechat_settings(); }
@@ -83,11 +83,11 @@ namespace {
 		}
 	};
 	$stored = static function (): array {
-		$v = get_option('aksrt_wechat_settings', []);
+		$v = get_option('jio_wechat_settings', []);
 		return is_array($v) ? $v : [];
 	};
 
-	$controller = \AKSRT\Admin\UserController::get_instance();
+	$controller = \Jio\Admin\UserController::get_instance();
 
 	// 1) GET /wechat/status 返回完整状态形状（密钥掩码）。
 	$response = $controller->get_wechat_status(new WP_REST_Request());
@@ -135,7 +135,7 @@ namespace {
 	$check('未知键被忽略', !array_key_exists('evil', $stored()));
 
 	// 6) 未配置时空密钥可显式清空。
-	update_option('aksrt_wechat_settings', ['enabled' => true, 'app_id' => 'a', 'app_secret' => '', 'template_id' => '']);
+	update_option('jio_wechat_settings', ['enabled' => true, 'app_id' => 'a', 'app_secret' => '', 'template_id' => '']);
 	$controller->update_wechat_settings(new WP_REST_Request(['app_secret' => '']));
 	$check('空密钥可清存', ($stored()['app_secret'] ?? '') === '');