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/vip-settings-structured-harness.php

@@ -3,7 +3,7 @@
  * Executable VIP structured-settings contract harness.
  *
  * Builds the payment schema with WordPress stubs, normalizes a stored
- * `aksrt_settings` snapshot through PaymentRuntime, and prints the result as
+ * `jio_settings` snapshot through PaymentRuntime, and prints the result as
  * JSON so the Node contract test can assert on the real shapes.
  */
 
@@ -26,7 +26,7 @@ namespace {
 	function wp_strip_all_tags($value): string { return trim(strip_tags((string) $value)); }
 	function wp_kses($value, $allowed = null): string { return (string) $value; }
 	function trailingslashit($value): string { return rtrim((string) $value, '/\\') . '/'; }
-	function get_template_directory_uri(): string { return 'https://example.test/wp-content/themes/aksrt'; }
+	function get_template_directory_uri(): string { return 'https://example.test/wp-content/themes/jio'; }
 	function absint($value): int { return max(0, (int) $value); }
 	function wp_json_encode($value, int $flags = 0): string { return json_encode($value, $flags | JSON_UNESCAPED_SLASHES); }
 	function is_multisite(): bool { return false; }
@@ -37,7 +37,7 @@ namespace {
 	function add_filter(...$args): void {}
 }
 
-namespace AKSRT\Settings {
+namespace Jio\Settings {
 	/** Test double: PaymentRuntime reads every raw settings key through this. */
 	final class Settings {
 		/** @var array<string,mixed> */
@@ -70,7 +70,7 @@ namespace {
 
 	/** Exposes the trait's private renew-pricing math for contract assertions. */
 	final class VipPricingProbe {
-		use \AKSRT\Content\VipServicePackages;
+		use \Jio\Content\VipServicePackages;
 
 		/** @param array<string,mixed> $pkg */
 		public function price(array $pkg, string $action, array $renew, int $days): ?array {
@@ -78,9 +78,9 @@ namespace {
 		}
 	}
 
-	use AKSRT\Admin\Schema\SchemaPayment;
-	use AKSRT\Settings\PaymentRuntime;
-	use AKSRT\Settings\Settings;
+	use Jio\Admin\Schema\SchemaPayment;
+	use Jio\Settings\PaymentRuntime;
+	use Jio\Settings\Settings;
 
 	$vip = SchemaPayment::build()['sections']['vip'];
 	$groups = [];
@@ -184,7 +184,7 @@ namespace {
 	// 或字符串；净化必须把值收敛回选项声明的类型，否则严格 in_array 校验会以
 	// "has an invalid value" 拒绝一次完全合法的保存。
 	$sanitize = (static function (): array {
-		$provider = \AKSRT\Admin\SchemaProvider::get_instance();
+		$provider = \Jio\Admin\SchemaProvider::get_instance();
 		$cases = [
 			'vip_html' => [
 				'pay_user_vip_1_name' => '<b>会员</b>',