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/site-notice.css

@@ -1,8 +1,8 @@
 /**
- * AKSRT Site Notice — Popup notice styles
+ * Jio Site Notice — Popup notice styles
  */
 
-.aksrt-site-notice {
+.jio-site-notice {
   position: fixed;
   inset: 0;
   z-index: 99998;
@@ -12,13 +12,13 @@
   padding: 20px;
 }
 
-.aksrt-site-notice__overlay {
+.jio-site-notice__overlay {
   position: absolute;
   inset: 0;
   background: rgba(0, 0, 0, 0.5);
 }
 
-.aksrt-site-notice__dialog {
+.jio-site-notice__dialog {
   position: relative;
   background: var(--surface-1, #fff);
   border-radius: var(--radius-lg, 12px);
@@ -28,21 +28,21 @@
   overflow-y: auto;
 }
 
-.aksrt-site-notice__head {
+.jio-site-notice__head {
   display: flex;
   align-items: center;
   justify-content: space-between;
   padding: 20px 24px 0;
 }
 
-.aksrt-site-notice__title {
+.jio-site-notice__title {
   margin: 0;
   font-size: 18px;
   font-weight: 700;
   color: var(--color-ink, #333);
 }
 
-.aksrt-site-notice__close {
+.jio-site-notice__close {
   width: 32px;
   height: 32px;
   border: none;
@@ -57,22 +57,22 @@
   transition: background 0.15s;
 }
 
-.aksrt-site-notice__close:hover {
+.jio-site-notice__close:hover {
   background: var(--surface-3, #ddd);
 }
 
-.aksrt-site-notice__body {
+.jio-site-notice__body {
   padding: 16px 24px;
   font-size: 14px;
   line-height: 1.7;
   color: var(--color-ink-2, #4e5358);
 }
 
-.aksrt-site-notice__body a {
+.jio-site-notice__body a {
   color: var(--color-primary);
 }
 
-.aksrt-site-notice__foot {
+.jio-site-notice__foot {
   padding: 0 24px 20px;
   text-align: center;
   display: flex;
@@ -82,8 +82,8 @@
 }
 
 /* Button base — shared by both <button> and <a> */
-.aksrt-site-notice__btn,
-.aksrt-site-notice__confirm {
+.jio-site-notice__btn,
+.jio-site-notice__confirm {
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -100,32 +100,32 @@
   color: #fff;
 }
 
-.aksrt-site-notice__btn:hover,
-.aksrt-site-notice__confirm:hover {
+.jio-site-notice__btn:hover,
+.jio-site-notice__confirm:hover {
   filter: brightness(1.08);
 }
 
 /* Button color variants */
-.aksrt-site-notice__btn--primary { background: var(--color-primary); }
-.aksrt-site-notice__btn--success { background: #10b981; }
-.aksrt-site-notice__btn--warning { background: #f59e0b; color: #1a1a1a; }
-.aksrt-site-notice__btn--danger  { background: #ef4444; }
-.aksrt-site-notice__btn--info    { background: #3b82f6; }
-.aksrt-site-notice__btn--purple  { background: #8b5cf6; }
-.aksrt-site-notice__btn--dark    { background: #374151; }
+.jio-site-notice__btn--primary { background: var(--color-primary); }
+.jio-site-notice__btn--success { background: #10b981; }
+.jio-site-notice__btn--warning { background: #f59e0b; color: #1a1a1a; }
+.jio-site-notice__btn--danger  { background: #ef4444; }
+.jio-site-notice__btn--info    { background: #3b82f6; }
+.jio-site-notice__btn--purple  { background: #8b5cf6; }
+.jio-site-notice__btn--dark    { background: #374151; }
 
 /* Modal size variants */
-.aksrt-site-notice__dialog.modal-mini { max-width: 320px; }
-.aksrt-site-notice__dialog.modal-sm   { max-width: 420px; }
-.aksrt-site-notice__dialog.modal-lg   { max-width: 720px; }
+.jio-site-notice__dialog.modal-mini { max-width: 320px; }
+.jio-site-notice__dialog.modal-sm   { max-width: 420px; }
+.jio-site-notice__dialog.modal-lg   { max-width: 720px; }
 /* Default dialog (no size class) */
-.aksrt-site-notice__dialog:not(.modal-mini):not(.modal-sm):not(.modal-lg) { max-width: 540px; }
+.jio-site-notice__dialog:not(.modal-mini):not(.modal-sm):not(.modal-lg) { max-width: 540px; }
 
 /* Dark mode */
-html.dark .aksrt-site-notice__dialog {
+html.dark .jio-site-notice__dialog {
   background: var(--surface-1, #323335);
 }
 
-html.dark .aksrt-site-notice__close {
+html.dark .jio-site-notice__close {
   background: var(--surface-3, #3a3b3e);
 }