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/css/frontend/pagination.css

@@ -1,6 +1,6 @@
 /* ========== 分页 — 对齐 legacy pagination ========== */
 .pagination,
-.aksrt-pagination,
+.jio-pagination,
 .navigation.pagination .nav-links,
 .pagenav.ajax-pag {
   display: flex;
@@ -13,8 +13,8 @@
 
 .pagination a,
 .pagination span,
-.aksrt-pagination a,
-.aksrt-pagination span,
+.jio-pagination a,
+.jio-pagination span,
 .navigation.pagination a,
 .navigation.pagination span,
 .pagenav.ajax-pag a,
@@ -37,7 +37,7 @@
 }
 
 .pagination a:hover,
-.aksrt-pagination a:hover,
+.jio-pagination a:hover,
 .navigation.pagination a:hover,
 .pagenav.ajax-pag a:hover {
   opacity: 1;
@@ -46,7 +46,7 @@
 }
 
 .pagination .current,
-.aksrt-pagination .current,
+.jio-pagination .current,
 .navigation.pagination .current,
 .pagenav.ajax-pag .current {
   color: var(--color-on-primary, #fff);
@@ -56,7 +56,7 @@
 }
 
 .pagination .dots,
-.aksrt-pagination .dots,
+.jio-pagination .dots,
 .navigation.pagination .dots,
 .pagenav.ajax-pag .dots {
   border: none;
@@ -70,8 +70,8 @@
 
 .pagination .prev,
 .pagination .next,
-.aksrt-pagination .prev,
-.aksrt-pagination .next,
+.jio-pagination .prev,
+.jio-pagination .next,
 .navigation.pagination .prev,
 .navigation.pagination .next,
 .pagenav.ajax-pag .prev,
@@ -81,8 +81,8 @@
 
 .pagination .prev i,
 .pagination .next i,
-.aksrt-pagination .prev i,
-.aksrt-pagination .next i,
+.jio-pagination .prev i,
+.jio-pagination .next i,
 .navigation.pagination .prev i,
 .navigation.pagination .next i,
 .pagenav.ajax-pag .prev i,
@@ -91,7 +91,7 @@
 }
 
 .pagenav.ajax-pag .pag-jump,
-.aksrt-pagination .pag-jump,
+.jio-pagination .pag-jump,
 .navigation.pagination .pag-jump {
   display: inline-flex;
   align-items: center;
@@ -100,7 +100,7 @@
 }
 
 .pagenav.ajax-pag .jump-input,
-.aksrt-pagination .jump-input,
+.jio-pagination .jump-input,
 .navigation.pagination .jump-input {
   width: 64px;
   min-width: 64px;
@@ -115,14 +115,14 @@
 }
 
 .pagenav.ajax-pag .jump-input:focus,
-.aksrt-pagination .jump-input:focus,
+.jio-pagination .jump-input:focus,
 .navigation.pagination .jump-input:focus {
   outline: none;
   border-color: var(--focus-color, var(--color-primary, #f04494));
 }
 
 .pagenav.ajax-pag .pag-jump .ajax-next,
-.aksrt-pagination .pag-jump .ajax-next,
+.jio-pagination .pag-jump .ajax-next,
 .navigation.pagination .pag-jump .ajax-next {
   min-width: auto;
   cursor: pointer;
@@ -159,8 +159,8 @@
 @media (max-width: 767px) {
   .pagination a,
   .pagination span,
-  .aksrt-pagination a,
-  .aksrt-pagination span,
+  .jio-pagination a,
+  .jio-pagination span,
   .navigation.pagination a,
   .navigation.pagination span,
   .pagenav.ajax-pag a,
@@ -171,7 +171,7 @@
   }
 
   .pagenav.ajax-pag .pag-jump,
-  .aksrt-pagination .pag-jump,
+  .jio-pagination .pag-jump,
   .navigation.pagination .pag-jump {
     width: 100%;
     justify-content: center;
@@ -180,7 +180,7 @@
   }
 
   .pagenav.ajax-pag .jump-input,
-  .aksrt-pagination .jump-input,
+  .jio-pagination .jump-input,
   .navigation.pagination .jump-input {
     width: 58px;
     min-width: 58px;