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>

tests/widget-system/front-submit-editor-contract.test.cjs

@@ -65,10 +65,10 @@ test('front submit uses the WordPress-managed jQuery runtime', () => {
   assert.doesNotMatch(source, /jquery-migrate/);
   assert.equal(fs.existsSync(path.join(root, 'assets/js/runtime/libs/jquery.min.js')), false);
   assert.equal(fs.existsSync(path.join(root, 'assets/js/runtime/libs/jquery-ui.min.js')), false);
-  assert.doesNotMatch(read('inc/modules/user-parts/urls.php'), /aksrt_get_profile_url/);
+  assert.doesNotMatch(read('inc/modules/user-parts/urls.php'), /jio_get_profile_url/);
 
   const page = read('templates/pages/page-submit.php');
-  assert.match(page, /\['loader_js', 'aksrt-front-submit-editor', 'aksrt-front-submit-pay-download'\]/);
+  assert.match(page, /\['loader_js', 'jio-front-submit-editor', 'jio-front-submit-pay-download'\]/);
 });
 
 test('legacy runtime modules use jQuery explicitly without a dollar alias', () => {
@@ -96,8 +96,8 @@ test('theme runtime never changes native listener passivity for third-party edit
   const buildTool = read('tools/build-public-assets.mjs');
   const publicRuntime = read('assets/js/runtime/main.min.js');
 
-  assert.doesNotMatch(scripts, /enqueue_passive_polyfill|aksrt-passive-events/);
-  assert.doesNotMatch(scriptsPart2, /enqueue_passive_polyfill|aksrt-passive-events/);
+  assert.doesNotMatch(scripts, /enqueue_passive_polyfill|jio-passive-events/);
+  assert.doesNotMatch(scriptsPart2, /enqueue_passive_polyfill|jio-passive-events/);
   assert.doesNotMatch(buildTool, /passive-events\.js/);
   assert.doesNotMatch(publicRuntime, /EventTarget\.prototype\.addEventListener|__passiveSupported/);
   assert.equal(fs.existsSync(path.join(root, 'assets/js/passive-events.js')), false);
@@ -137,6 +137,6 @@ test('front submit TinyMCE status bar shows one live character counter', () => {
   assert.match(editor, /textContent\s*=\s*'字数：'\s*\+\s*count/);
   assert.match(editor, /editor\.on\('init SetContent input keyup change Undo Redo'/);
   assert.match(editor, /replace\(\/\\s\+\/g, ''\)\.length/);
-  assert.match(submitCss, /\.newposts-editor \.aksrt-submit-word-count\s*{[^}]*float:\s*right;/);
-  assert.doesNotMatch(legacyPageEdit, /initWordCount|updateWordCount|aksrt-page-edit__word-count|字数:/);
+  assert.match(submitCss, /\.newposts-editor \.jio-submit-word-count\s*{[^}]*float:\s*right;/);
+  assert.doesNotMatch(legacyPageEdit, /initWordCount|updateWordCount|jio-page-edit__word-count|字数:/);
 });