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/admin/post-extension.css

@@ -1,8 +1,8 @@
-.aksrt-post-extension {
+.jio-post-extension {
   margin: -6px -12px -12px;
 }
 
-.aksrt-post-extension__field {
+.jio-post-extension__field {
   box-sizing: border-box;
   display: grid;
   grid-template-columns: 34% minmax(0, 1fr);
@@ -12,11 +12,11 @@
   border-top: 1px solid #eee;
 }
 
-.aksrt-post-extension__field:first-child {
+.jio-post-extension__field:first-child {
   border-top: 0;
 }
 
-.aksrt-post-extension__title {
+.jio-post-extension__title {
   box-sizing: border-box;
   margin: 0;
   padding-top: 6px;
@@ -27,23 +27,23 @@
   text-align: right;
 }
 
-.aksrt-post-extension__control,
-.aksrt-post-extension__control input[type="text"],
-.aksrt-post-extension__control input[type="url"],
-.aksrt-post-extension__control input[type="number"] {
+.jio-post-extension__control,
+.jio-post-extension__control input[type="text"],
+.jio-post-extension__control input[type="url"],
+.jio-post-extension__control input[type="number"] {
   box-sizing: border-box;
   min-width: 0;
   width: 100%;
 }
 
-.aksrt-post-extension__control input[type="text"],
-.aksrt-post-extension__control input[type="url"],
-.aksrt-post-extension__control input[type="number"] {
+.jio-post-extension__control input[type="text"],
+.jio-post-extension__control input[type="url"],
+.jio-post-extension__control input[type="number"] {
   min-height: 30px;
   line-height: 30px;
 }
 
-.aksrt-post-extension__control .description {
+.jio-post-extension__control .description {
   display: block;
   margin: 5px 0 0;
   color: #777;
@@ -51,40 +51,40 @@
   line-height: 1.55;
 }
 
-.aksrt-post-extension__danger {
+.jio-post-extension__danger {
   color: #ff4646;
 }
 
-.aksrt-post-extension__upload {
+.jio-post-extension__upload {
   display: grid;
   grid-template-columns: minmax(0, 1fr) auto;
   gap: 5px;
 }
 
-.aksrt-post-extension__upload .button-link-delete {
+.jio-post-extension__upload .button-link-delete {
   grid-column: 1 / -1;
   justify-self: start;
 }
 
-.aksrt-post-extension__buttons {
+.jio-post-extension__buttons {
   display: flex;
   align-items: center;
   gap: 8px;
   margin-top: 7px;
 }
 
-.aksrt-post-extension__gallery {
+.jio-post-extension__gallery {
   display: flex;
   flex-wrap: wrap;
   align-items: flex-start;
   gap: 5px;
 }
 
-.aksrt-post-extension__gallery:empty {
+.jio-post-extension__gallery:empty {
   display: none;
 }
 
-.aksrt-post-extension__gallery img {
+.jio-post-extension__gallery img {
   display: block;
   width: auto;
   height: auto;
@@ -96,23 +96,23 @@
   background: #f6f7f7;
 }
 
-.aksrt-post-extension__radios {
+.jio-post-extension__radios {
   display: grid;
   gap: 7px;
 }
 
-.aksrt-post-extension__radios label,
-.aksrt-custom-filter-field label {
+.jio-post-extension__radios label,
+.jio-custom-filter-field label {
   display: block;
   margin: 0;
 }
 
-.aksrt-post-extension__field--check {
+.jio-post-extension__field--check {
   display: block;
   padding-left: calc(34% + 22px);
 }
 
-.aksrt-post-extension__episode {
+.jio-post-extension__episode {
   position: relative;
   margin: 8px 0;
   padding: 8px;
@@ -121,24 +121,24 @@
   background: rgba(255, 255, 255, 0.45);
 }
 
-.aksrt-post-extension__episode > input {
+.jio-post-extension__episode > input {
   margin-bottom: 5px;
 }
 
-.aksrt-post-extension__episode > .button-link-delete {
+.jio-post-extension__episode > .button-link-delete {
   margin-top: 6px;
 }
 
-.aksrt-custom-filter-field {
+.jio-custom-filter-field {
   padding: 9px 0;
   border-bottom: 1px solid #eee;
 }
 
-.aksrt-custom-filter-field:last-child {
+.jio-custom-filter-field:last-child {
   border-bottom: 0;
 }
 
-.aksrt-custom-filter-field strong {
+.jio-custom-filter-field strong {
   display: block;
   margin-bottom: 7px;
   color: #0991f5;
@@ -149,16 +149,16 @@ body.block-editor-page #post_main .inside {
 }
 
 @media (max-width: 782px) {
-  .aksrt-post-extension__field {
+  .jio-post-extension__field {
     grid-template-columns: 1fr;
   }
 
-  .aksrt-post-extension__title {
+  .jio-post-extension__title {
     padding-top: 0;
     text-align: left;
   }
 
-  .aksrt-post-extension__field--check {
+  .jio-post-extension__field--check {
     padding-left: 12px;
   }
 }