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/js/color-extract.js

@@ -1,14 +1,14 @@
 /**
- * AKSRT Color Extract
+ * Jio Color Extract
  *
  * Extracts dominant colors from images and applies them as dynamic accents.
  * Uses canvas-based color sampling — no external dependencies.
  *
  * Usage:
- *   <img data-aksrt-color-extract data-aksrt-color-target=".card">
- *   <!-- Will set --aksrt-dynamic-color on .card based on image colors -->
+ *   <img data-jio-color-extract data-jio-color-target=".card">
+ *   <!-- Will set --jio-dynamic-color on .card based on image colors -->
  *
- * @package AKSRT
+ * @package Jio
  */
 
 (function () {
@@ -87,19 +87,19 @@
     if (!target || !color) return;
 
     var r = color.r, g = color.g, b = color.b;
-    target.style.setProperty('--aksrt-dynamic-color', color.hex);
-    target.style.setProperty('--aksrt-dynamic-color-rgb', r + ',' + g + ',' + b);
-    target.style.setProperty('--aksrt-dynamic-color-light', lighten(r, g, b, 60));
-    target.style.setProperty('--aksrt-dynamic-color-dark', darken(r, g, b, 40));
+    target.style.setProperty('--jio-dynamic-color', color.hex);
+    target.style.setProperty('--jio-dynamic-color-rgb', r + ',' + g + ',' + b);
+    target.style.setProperty('--jio-dynamic-color-light', lighten(r, g, b, 60));
+    target.style.setProperty('--jio-dynamic-color-dark', darken(r, g, b, 40));
 
     // Add a subtle tinted background if target doesn't already have one
     if (!target.style.background && !target.style.backgroundColor) {
-      target.style.setProperty('--aksrt-dynamic-bg', 'rgba(' + r + ',' + g + ',' + b + ',0.05)');
+      target.style.setProperty('--jio-dynamic-bg', 'rgba(' + r + ',' + g + ',' + b + ',0.05)');
     }
   }
 
   function processImage(img) {
-    if (img.dataset.aksrtColorDone) return;
+    if (img.dataset.jioColorDone) return;
 
     // Need crossOrigin for canvas access
     if (!img.crossOrigin && img.src.indexOf(window.location.origin) !== 0) {
@@ -110,9 +110,9 @@
       var color = extractColor(img);
       if (!color) return;
 
-      img.dataset.aksrtColorDone = '1';
+      img.dataset.jioColorDone = '1';
 
-      var targetSelector = img.dataset.aksrtColorTarget;
+      var targetSelector = img.dataset.jioColorTarget;
       var target = targetSelector
         ? img.closest(targetSelector) || document.querySelector(targetSelector)
         : img.parentElement;
@@ -128,11 +128,11 @@
   }
 
   function init() {
-    document.querySelectorAll('[data-aksrt-color-extract]').forEach(processImage);
+    document.querySelectorAll('[data-jio-color-extract]').forEach(processImage);
   }
 
   // Public API
-  window.AksrtColorExtract = {
+  window.JioColorExtract = {
     extract: extractColor,
     apply: applyColor,
     process: processImage,
@@ -144,7 +144,7 @@
   } else {
     init();
   }
-  // AJAX 注入新内容后由 auto_fun 重扫（dataset.aksrtColorDone 标记保证幂等）。
+  // AJAX 注入新内容后由 auto_fun 重扫（dataset.jioColorDone 标记保证幂等）。
   if (window.jQuery) {
     window.jQuery(document).on('auto_fun', init);
   }