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/ticket-spa-config-contract.test.cjs

@@ -4,7 +4,7 @@
  * SPA「工单中心」接线契约：
  * 1) /users/ticket 是 customPage，组件 UsersTicket 已注册并能被 router 解析；
  * 2) 页面内嵌 SchemaPage 承载 users/ticket 分区，schema 表单零改动复用；
- * 3) 三块字典 CRUD 走 TicketRestAdmin（aksrt/v1/admin）的封装模块；
+ * 3) 三块字典 CRUD 走 TicketRestAdmin（jio/v1/admin）的封装模块；
  * 4) 双向深链：SPA → 原生工单列表，原生 → SPA 工单中心；
  * 5) 配置 Tab 的残留（tab=config / UsersMenusTicketsConfig）不得回流。
  */
@@ -49,16 +49,16 @@ test('UsersTicket embeds the schema page and the three CRUD panels', () => {
   }
 
   // 反向深链：回到原生工单列表。
-  assert.match(page, /users\.php\?page=aksrt_tickets/);
-  assert.match(page, /window\.aksrtAdminData\?\.adminUrl/);
+  assert.match(page, /users\.php\?page=jio_tickets/);
+  assert.match(page, /window\.jioAdminData\?\.adminUrl/);
 });
 
 test('ticket admin REST is wrapped in its own api module and registered', () => {
   const module = read('assets/admin/src/api/modules/tickets.js');
 
-  // TicketRestAdmin 挂在 aksrt/v1/admin，客户端 baseUrl 只到 aksrt/v1，
-  // 因此必须走 /aksrt/ 全路径形式。
-  assert.match(module, /'\/aksrt\/v1\/admin\/tickets'/);
+  // TicketRestAdmin 挂在 jio/v1/admin，客户端 baseUrl 只到 jio/v1，
+  // 因此必须走 /jio/ 全路径形式。
+  assert.match(module, /'\/jio\/v1\/admin\/tickets'/);
 
   for (const method of [
     'listTicketStatuses', 'createTicketStatus', 'updateTicketStatus', 'deleteTicketStatus',
@@ -81,7 +81,7 @@ test('panels enforce the backend guards instead of trusting the client', () => {
   assert.match(status, /disabled: row\.is_default/);
   // 颜色必须落在 TicketStatusService::sanitize_color() 接受的范围内。
   assert.match(status, /import \{ toHex \} from '@\/utils\/color\.js'/);
-  assert.match(status, /<AksColorPicker/);
+  assert.match(status, /<JioColorPicker/);
   assert.doesNotMatch(status, /n-color-picker|HEX_RE/);
   assert.match(status, /#6b7280/);
   const color = read('assets/admin/src/utils/color.js');