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>

assets/js/section-navs.js

@@ -55,9 +55,9 @@
 
   function fillBox(box, signature) {
     if (entries.length < 3) {
-      if (box.dataset.aksrtSectionNav === '1') {
+      if (box.dataset.jioSectionNav === '1') {
         box.replaceChildren();
-        delete box.dataset.aksrtSectionNav;
+        delete box.dataset.jioSectionNav;
         rendered.delete(box);
       }
       return;
@@ -68,7 +68,7 @@
       return;
     }
     box.replaceChildren();
-    box.dataset.aksrtSectionNav = '1';
+    box.dataset.jioSectionNav = '1';
     rendered.set(box, signature);
     var title = box.getAttribute('data-title') || '';
     if (title) {
@@ -180,7 +180,7 @@
   window.addEventListener('scroll', scheduleSpy, { passive: true });
   window.addEventListener('resize', init, { passive: true });
   window.addEventListener('hashchange', followHash);
-  jQuery(document).off('auto_fun.aksrt-section-navs').on('auto_fun.aksrt-section-navs', init);
+  jQuery(document).off('auto_fun.jio-section-navs').on('auto_fun.jio-section-navs', init);
   if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init, { once: true });
   else init();
 })();