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>

tools/build-svg-sprite.mjs

@@ -4,8 +4,8 @@
  *
  * Source: assets/icons/sprite/{key}.svg — one 1024x1024 icon per file.
  *         The file name (without .svg) is the sprite key used by
- *         aksrt_icon_markup('zibsvg-{key}') and <use xlink:href="#icon-{key}">.
- * Output: assets/js/runtime/svg-icon.js — aksrt_svgs['key'] = '<path…>' map
+ *         jio_icon_markup('zibsvg-{key}') and <use xlink:href="#icon-{key}">.
+ * Output: assets/js/runtime/svg-icon.js — jio_svgs['key'] = '<path…>' map
  *         plus the runtime that injects <symbol> definitions into the page.
  *
  * Usage:  node tools/build-svg-sprite.mjs
@@ -59,7 +59,7 @@ for (const file of files) {
     errors.push(`${file}: contains a backslash or single quote`);
     continue;
   }
-  entries.push(`aksrt_svgs['${key}'] = '${inner}';`);
+  entries.push(`jio_svgs['${key}'] = '${inner}';`);
 }
 
 if (errors.length) {
@@ -74,15 +74,15 @@ function show_svg() {
             viewbox = _t.attr('data-viewbox'),
             svgclass = _t.attr('data-class'),
             svgname = _t.attr('data-svg'),
-            svg_html = '<svg class="' + svgclass + '" viewBox="' + viewbox + '">' + aksrt_svgs[svgname] + '</svg>';
+            svg_html = '<svg class="' + svgclass + '" viewBox="' + viewbox + '">' + jio_svgs[svgname] + '</svg>';
         _t.html(svg_html);
     });
 }
 
 !(function () {
     var svg = '';
-    for (let key in aksrt_svgs) {
-        svg += aksrt_svgs[key] ? '<symbol id="icon-' + key + '" viewBox="0 0 1024 1024">' + aksrt_svgs[key] + '</symbol>' : '';
+    for (let key in jio_svgs) {
+        svg += jio_svgs[key] ? '<symbol id="icon-' + key + '" viewBox="0 0 1024 1024">' + jio_svgs[key] + '</symbol>' : '';
     }
 
     var i = '<svg id="svg-icons" aria-hidden="true" style="position:absolute;width:0px;height:0px;overflow:hidden;">' + svg + '</svg>';
@@ -92,6 +92,6 @@ function show_svg() {
 })(window);
 `;
 
-const header = `/* Generated by tools/build-svg-sprite.mjs from assets/icons/sprite/*.svg — do not edit by hand. */\n'use strict';\nvar aksrt_svgs = [];\n`;
+const header = `/* Generated by tools/build-svg-sprite.mjs from assets/icons/sprite/*.svg — do not edit by hand. */\n'use strict';\nvar jio_svgs = [];\n`;
 writeFileSync(outFile, header + entries.join('\n') + '\n' + runtime);
 console.log(`Built ${entries.length} sprite icons -> assets/js/runtime/svg-icon.js`);