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/user-profile-phone-contract.test.cjs

@@ -38,23 +38,23 @@ test('phone binding, registration, and sign-in share phone_number as the only ph
   assert.match(registrationAndBinding, /'meta_key'\s*=>\s*'phone_number'/);
   assert.match(handlers, /'meta_key'\s*=>\s*'phone_number'/);
   assert.match(account, /get_user_meta\(\$account_user_id, 'phone_number', true\)/);
-  assert.doesNotMatch(runtime, /['"]aksrt_phone['"]/);
-  assert.match(admin, /aksrt_phone_verified/);
+  assert.doesNotMatch(runtime, /['"]jio_phone['"]/);
+  assert.match(admin, /jio_phone_verified/);
   assert.match(admin, /wp_verify_nonce/);
   assert.match(admin, /current_user_can\('edit_user'/);
 });
 
 test('native profile exposes the reference fields and continues using canonical media/profile metadata', () => {
   const admin = read('src/User/ProfileAdmin.php');
-  const avatar = read('inc/helpers/aksrt-avatar.php');
-  const profile = read('inc/helpers/aksrt-user-center.php');
+  const avatar = read('inc/helpers/jio-avatar.php');
+  const profile = read('inc/helpers/jio-user-center.php');
   const form = read('inc/helpers/user-center-renderers/profile-form.php');
   const publicProfile = read('templates/parts/user/author-hero.php');
 
   ['自定义头像', '自定义封面', '性别', 'QQ', '微信', '微博', 'GitHub', '住址', '绑定手机号'].forEach((label) => assert.ok(admin.includes(label), `missing ${label}`));
-  assert.match(admin, /'aksrt_avatar_attachment_id'/);
-  assert.match(admin, /'aksrt_background_attachment_id'/);
-  assert.match(admin, /'aksrt_profile_details'/);
+  assert.match(admin, /'jio_avatar_attachment_id'/);
+  assert.match(admin, /'jio_background_attachment_id'/);
+  assert.match(admin, /'jio_profile_details'/);
   assert.match(profile, /'weibo'\s*=>/);
   assert.match(profile, /'address'\s*=>/);
   assert.match(profile, /\$existing_details\['weibo'\]/);
@@ -63,5 +63,5 @@ test('native profile exposes the reference fields and continues using canonical
   assert.match(form, /name="address"/);
   assert.match(publicProfile, /\$profile_details\['weibo'\]/);
   assert.match(publicProfile, /\$profile_details\['address'\]/);
-  assert.doesNotMatch(avatar, /aksrt_render_admin_avatar_field|aksrt_save_admin_avatar_field/);
+  assert.doesNotMatch(avatar, /jio_render_admin_avatar_field|jio_save_admin_avatar_field/);
 });