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/referral-policy-contract.test.cjs

@@ -72,12 +72,12 @@ test('commission is credited immediately with no settlement freeze', () => {
   assert.doesNotMatch(attribution, /->stats\(/)
 
   // 即时入账模型：不再有结算冻结期 / 结算 cron / settle_due 方法。
-  assert.doesNotMatch(ledger, /aksrt_affiliate_settle_due'?, \[\$this, 'settle_due'\]/)
-  assert.doesNotMatch(ledger, /wp_schedule_event\([^)]*aksrt_affiliate_settle_due/)
+  assert.doesNotMatch(ledger, /jio_affiliate_settle_due'?, \[\$this, 'settle_due'\]/)
+  assert.doesNotMatch(ledger, /wp_schedule_event\([^)]*jio_affiliate_settle_due/)
   assert.doesNotMatch(ledger, /function settle_due|function settle_one/)
   assert.doesNotMatch(ledger, /available_at|settled_at/)
   // 遗留结算 cron 需在 init() 主动清理。
-  assert.match(ledger, /wp_unschedule_event\([^)]*aksrt_affiliate_settle_due/)
+  assert.match(ledger, /wp_unschedule_event\([^)]*jio_affiliate_settle_due/)
 
   // 下单支付即把佣金 credit 到 COMMISSION 资金池。
   assert.match(ledger, /AssetType::COMMISSION/)
@@ -96,7 +96,7 @@ test('referral codes are self-serve: no admin ops page, granted at registration'
 
   // 用户菜单不再挂"推广码运营"页，trait 文件已删除。
   const menus = read('src', 'Admin', 'Native', 'UsersMenus.php')
-  assert.doesNotMatch(menus, /UsersMenusReferral|aksrt_referral_codes|render_referral_codes_page/)
+  assert.doesNotMatch(menus, /UsersMenusReferral|jio_referral_codes|render_referral_codes_page/)
   assert.equal(fs.existsSync(path.join(root, 'src', 'Admin', 'Native', 'UsersMenusReferral.php')), false)
 
   // admin SPA 不再保留跳转路由。