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/pending-upload-contract.test.cjs

@@ -48,7 +48,7 @@ test('front-end remove buttons discard the pending upload', () => {
   const core = read('assets/js/ticket-center-core.js');
   const report = read('assets/js/report.js');
   assert.match(core, /'\/upload\/pending\/' \+ id/);
-  assert.match(core, /data-aksrt-ticket-image-id/);
+  assert.match(core, /data-jio-ticket-image-id/);
   assert.match(report, /'\/upload\/pending\/'/);
 });
 
@@ -65,11 +65,11 @@ test('front submission uploads are marked and saved references are claimed witho
 
 test('cleanup is scheduled once hourly and discard requires a logged-in user', () => {
   const state = harness().registration;
-  assert.ok(state.hooks.includes('aksrt_pending_upload_cleanup'));
+  assert.ok(state.hooks.includes('jio_pending_upload_cleanup'));
   assert.ok(state.hooks.includes('init'));
   assert.equal(state.schedule_count, 1);
   assert.equal(state.recurrence, 'hourly');
-  assert.equal(state.namespace, 'aksrt/v1');
+  assert.equal(state.namespace, 'jio/v1');
   assert.equal(state.method, 'DELETE');
   assert.equal(state.member_allowed, true);
   assert.equal(state.guest_allowed, false);
@@ -95,7 +95,7 @@ test('cleanup deletes only expired unattached pending uploads and uses prepared
   assert.match(state.query.sql, /p\.post_type = 'attachment' AND p\.post_parent = 0/);
   assert.match(state.query.sql, /m\.meta_key = %s/);
   assert.match(state.query.sql, /LIMIT %d/);
-  assert.equal(state.query.params[0], '_aksrt_pending_upload');
+  assert.equal(state.query.params[0], '_jio_pending_upload');
   assert.equal(state.query.params[2], 100);
   assert.ok(Math.abs(state.query.params[1] - (Math.floor(Date.now() / 1000) - 86400)) < 10);
 });