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-points-exchange-description-harness.php

@@ -12,10 +12,10 @@ namespace {
     function esc_attr__($value, string $domain = ''): string { return (string) $value; }
     function esc_url($value): string { return (string) $value; }
     function wp_kses_post($value): string { return (string) $value; }
-    function aksrt_get_user_center_tab_url(string $tab): string { return '/user/' . $tab; }
+    function jio_get_user_center_tab_url(string $tab): string { return '/user/' . $tab; }
 }
 
-namespace AKSRT\Settings {
+namespace Jio\Settings {
     final class Settings {
         public static function credits_enabled(): bool { return true; }
     }
@@ -25,7 +25,7 @@ namespace {
     require dirname(__DIR__, 2) . '/src/Content/VipServiceModal.php';
 
     final class VipPointsDescriptionProbe {
-        use \AKSRT\Content\VipServiceModal;
+        use \Jio\Content\VipServiceModal;
 
         /** @return array<string,mixed> */
         private function get_vip_settings_context(): array {
@@ -52,7 +52,7 @@ namespace {
                     ]],
                 ],
                 // 可用 argv 覆盖余额，用于覆盖「不足」分支（套餐价 500）。
-                'user_points' => isset($GLOBALS['aksrt_probe_points']) ? (int) $GLOBALS['aksrt_probe_points'] : 1000,
+                'user_points' => isset($GLOBALS['jio_probe_points']) ? (int) $GLOBALS['jio_probe_points'] : 1000,
                 // 自定义货币名（后台「积分配置 → 自定义货币名称」）：标题/我的X/
                 // 不足提示都跟随它，不硬编码「积分」。
                 'currency_name' => '书币',
@@ -60,6 +60,6 @@ namespace {
         }
     }
 
-    $GLOBALS['aksrt_probe_points'] = isset($argv[1]) ? (int) $argv[1] : 1000;
+    $GLOBALS['jio_probe_points'] = isset($argv[1]) ? (int) $argv[1] : 1000;
     echo (new VipPointsDescriptionProbe())->get_points_exchange_modal_html(1);
 }