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>

tools/admin-contract-map.md

@@ -22,15 +22,15 @@ Exit code `1` means hard contract errors.
 
 | Domain | PHP builder map key | Menu constants file |
 |--------|---------------------|---------------------|
-| global | `AKSRT_Admin_Schema_Global` | `assets/admin/src/constants/sections/global.js` |
-| page_display | `AKSRT_Admin_Schema_Page_Display` | `page-display.js` |
-| post_list | `AKSRT_Admin_Schema_Post_List` | `post-list.js` |
-| permissions | `AKSRT_Admin_Schema_Permissions` | `permissions.js` |
-| users | `AKSRT_Admin_Schema_Users` | `users.js` |
-| payment | `AKSRT_Admin_Schema_Payment` | `payment.js` |
-| extensions | `AKSRT_Admin_Schema_Extensions` | `extensions.js` |
-| tools | `AKSRT_Admin_Schema_Tools` | `tools.js` |
-| shop | `AKSRT_Admin_Schema_Shop` | `shop.js` |
+| global | `JIO_Admin_Schema_Global` | `assets/admin/src/constants/sections/global.js` |
+| page_display | `JIO_Admin_Schema_Page_Display` | `page-display.js` |
+| post_list | `JIO_Admin_Schema_Post_List` | `post-list.js` |
+| permissions | `JIO_Admin_Schema_Permissions` | `permissions.js` |
+| users | `JIO_Admin_Schema_Users` | `users.js` |
+| payment | `JIO_Admin_Schema_Payment` | `payment.js` |
+| extensions | `JIO_Admin_Schema_Extensions` | `extensions.js` |
+| tools | `JIO_Admin_Schema_Tools` | `tools.js` |
+| shop | `JIO_Admin_Schema_Shop` | `shop.js` |
 
 ## Known custom pages (not schema REST)
 
@@ -40,7 +40,7 @@ These use dedicated Vue pages + dedicated REST modules:
 - Footer: `FooterSettings` + footer settings API
 - Permissions capabilities matrix: `PermissionsCapabilities` + `/permissions/capabilities`
 - Shop products/orders and other operational tables
-- 工单中心: `UsersTicket` + schema `users/ticket` + `aksrt/v1/admin/tickets*`（部门 / 状态 / 预设回复）
+- 工单中心: `UsersTicket` + schema `users/ticket` + `jio/v1/admin/tickets*`（部门 / 状态 / 预设回复）
 
 ## Deploy checklist