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>

tools/audit-widget-system.php

@@ -47,12 +47,12 @@ if (!function_exists('sanitize_hex_color')) {
 
 require dirname(__DIR__) . '/vendor/autoload.php';
 
-use AKSRT\WidgetSystem\FieldSchema;
-use AKSRT\WidgetSystem\PostQuery;
-use AKSRT\WidgetSystem\RendererRegistry;
-use AKSRT\WidgetSystem\WidgetAreas;
-use AKSRT\WidgetSystem\WidgetRegistry;
-use AKSRT\WidgetSystem\WidgetTransfer;
+use Jio\WidgetSystem\FieldSchema;
+use Jio\WidgetSystem\PostQuery;
+use Jio\WidgetSystem\RendererRegistry;
+use Jio\WidgetSystem\WidgetAreas;
+use Jio\WidgetSystem\WidgetRegistry;
+use Jio\WidgetSystem\WidgetTransfer;
 
 $errors = [];
 $expected = [
@@ -124,7 +124,7 @@ $walk = static function (array $fields, string $owner) use (&$walk, &$errors, $s
 };
 
 foreach ($registry as $slug => $definition) {
-	if ($definition->id_base() !== 'aksrt_widget_' . $slug) {
+	if ($definition->id_base() !== 'jio_widget_' . $slug) {
 		$errors[] = $slug . ': invalid id_base.';
 	}
 	if (preg_match('/(?:bbs|forum|shop|cart|inventory|shipping)/i', $slug . ' ' . $definition->renderer())) {
@@ -257,7 +257,7 @@ if (str_contains($asset_source, 'cdn.jsdelivr.net')) {
 }
 $admin_import_sources = (string) file_get_contents($root . '/src/Admin/ImportExportController.php')
 	. (string) file_get_contents($root . '/src/Admin/ImportExportControllerPart1.php');
-foreach (['/widgets/export', '/widgets/import', '/widgets/templates', 'aksrt_widget_templates'] as $legacy_contract) {
+foreach (['/widgets/export', '/widgets/import', '/widgets/templates', 'jio_widget_templates'] as $legacy_contract) {
 	if (str_contains($admin_import_sources, $legacy_contract)) {
 		$errors[] = 'Legacy widget import/export contract remains: ' . $legacy_contract;
 	}