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-icon-picker.css

@@ -1,10 +1,10 @@
-/* AKSRT universal icon picker (admin) */
+/* Jio universal icon picker (admin) */
 
-#aksrt-modal-icon.aksrt-icon-modal {
+#jio-modal-icon.jio-icon-modal {
   display: none;
 }
 
-#aksrt-modal-icon.aksrt-icon-modal:not(.hidden) {
+#jio-modal-icon.jio-icon-modal:not(.hidden) {
   display: flex;
   position: fixed;
   inset: 0;
@@ -15,17 +15,17 @@
 
 /* Tab/search switching toggles the [hidden] attribute, but the explicit
    display rules below would beat the UA's [hidden] rule — re-assert it. */
-#aksrt-modal-icon [hidden] {
+#jio-modal-icon [hidden] {
   display: none !important;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__overlay {
+#jio-modal-icon .jio-icon-modal__overlay {
   position: absolute;
   inset: 0;
   background: rgba(0, 0, 0, 0.55);
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__inner {
+#jio-modal-icon .jio-icon-modal__inner {
   position: relative;
   z-index: 1;
   display: flex;
@@ -38,7 +38,7 @@
   overflow: hidden;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__header {
+#jio-modal-icon .jio-icon-modal__header {
   display: flex;
   align-items: center;
   justify-content: space-between;
@@ -47,14 +47,14 @@
   font-size: 14px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__close {
+#jio-modal-icon .jio-icon-modal__close {
   font-size: 20px;
   line-height: 1;
   text-decoration: none;
   cursor: pointer;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__toolbar {
+#jio-modal-icon .jio-icon-modal__toolbar {
   display: flex;
   flex-wrap: wrap;
   gap: 8px;
@@ -63,40 +63,40 @@
   border-bottom: 1px solid #e2e4e7;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__tabs {
+#jio-modal-icon .jio-icon-modal__tabs {
   display: flex;
   flex-wrap: wrap;
   gap: 6px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__tab.is-active {
+#jio-modal-icon .jio-icon-modal__tab.is-active {
   border-color: #2271b1;
   color: #2271b1;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__body {
+#jio-modal-icon .jio-icon-modal__body {
   position: relative;
   overflow-y: auto;
   padding: 12px 16px 16px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__loading {
+#jio-modal-icon .jio-icon-modal__loading {
   padding: 24px 0;
   text-align: center;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__error {
+#jio-modal-icon .jio-icon-modal__error {
   color: #b32d2e;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__grid {
+#jio-modal-icon .jio-icon-modal__grid {
   display: grid;
   grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
   gap: 4px;
   margin-top: 8px;
 }
 
-#aksrt-modal-icon .aksrt-icon-picker__item {
+#jio-modal-icon .jio-icon-picker__item {
   display: flex;
   align-items: center;
   justify-content: center;
@@ -111,18 +111,18 @@
   cursor: pointer;
 }
 
-#aksrt-modal-icon .aksrt-icon-picker__item:hover {
+#jio-modal-icon .jio-icon-picker__item:hover {
   border-color: #2271b1;
   color: #2271b1;
 }
 
-#aksrt-modal-icon .aksrt-icon-picker__item .icon {
+#jio-modal-icon .jio-icon-picker__item .icon {
   width: 20px;
   height: 20px;
   fill: currentColor;
 }
 
-#aksrt-modal-icon .aksrt-icon-picker__empty {
+#jio-modal-icon .jio-icon-picker__empty {
   grid-column: 1 / -1;
   padding: 20px 0;
   color: #787c82;
@@ -131,22 +131,22 @@
 
 /* Custom SVG tab */
 
-#aksrt-modal-icon .aksrt-icon-modal__custom {
+#jio-modal-icon .jio-icon-modal__custom {
   margin-top: 4px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__custom textarea {
+#jio-modal-icon .jio-icon-modal__custom textarea {
   margin-top: 4px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__custom-actions {
+#jio-modal-icon .jio-icon-modal__custom-actions {
   display: flex;
   align-items: center;
   gap: 10px;
   margin-top: 8px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__custom-preview {
+#jio-modal-icon .jio-icon-modal__custom-preview {
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -157,12 +157,12 @@
   font-size: 18px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__custom-preview svg {
+#jio-modal-icon .jio-icon-modal__custom-preview svg {
   width: 20px;
   height: 20px;
 }
 
-#aksrt-modal-icon .aksrt-icon-modal__grid--session {
+#jio-modal-icon .jio-icon-modal__grid--session {
   margin-top: 12px;
   padding-top: 8px;
   border-top: 1px solid #e2e4e7;
@@ -170,14 +170,14 @@
 
 /* Field markup (widgets, nav menus, meta boxes) */
 
-.aksrt-icon-picker {
+.jio-icon-picker {
   display: flex;
   flex-wrap: wrap;
   align-items: center;
   gap: 8px;
 }
 
-.aksrt-icon-picker .aksrt-icon-picker__preview {
+.jio-icon-picker .jio-icon-picker__preview {
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -189,13 +189,13 @@
   font-size: 16px;
 }
 
-.aksrt-icon-picker .aksrt-icon-picker__preview svg {
+.jio-icon-picker .jio-icon-picker__preview svg {
   width: 18px;
   height: 18px;
   fill: currentColor;
 }
 
-.aksrt-icon-picker .aksrt-icon-picker__value {
+.jio-icon-picker .jio-icon-picker__value {
   flex: 1 1 160px;
   min-width: 0;
 }