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-pending-harness.php

@@ -143,9 +143,9 @@ namespace {
 
 	function fp_attachment(int $id, int $author = 7, string $mime = 'image/jpeg', int $parent = 0, string $status = 'inherit', bool $pending = true, ?string $kind = 'image'): WP_Post {
 		$post = fp_post($id, 'attachment', $author, $status, '', $parent, $mime);
-		if ($kind !== null) update_post_meta($id, '_aksrt_front_submit_media', $kind);
+		if ($kind !== null) update_post_meta($id, '_jio_front_submit_media', $kind);
 		$GLOBALS['front_pending_state']['url_map']['https://example.test/uploads/media-' . $id . '.' . fp_ext($mime)] = $id;
-		if ($pending) \AKSRT\Attachment\PendingUploads::mark($id);
+		if ($pending) \Jio\Attachment\PendingUploads::mark($id);
 		return $post;
 	}
 
@@ -156,7 +156,7 @@ namespace {
 	}
 
 	function fp_pending(int $id): bool {
-		return get_post_meta($id, \AKSRT\Attachment\PendingUploads::META, true) !== '';
+		return get_post_meta($id, \Jio\Attachment\PendingUploads::META, true) !== '';
 	}
 
 	function fp_article_data(string $content, array $extra = []): array {
@@ -265,7 +265,7 @@ namespace {
 		}
 		return $id;
 	}
-	function aksrt_get_pay_meta($post_id): array {
+	function jio_get_pay_meta($post_id): array {
 		return $GLOBALS['front_pending_state']['pay_meta'][(int) $post_id] ?? [];
 	}
 	function attachment_url_to_postid($url): int {
@@ -343,10 +343,10 @@ namespace {
 	require_once dirname(__DIR__, 2) . '/src/Core/FrontSubmit.php';
 }
 
-namespace AKSRT\Core {
+namespace Jio\Core {
 	final class DomainModel {
-		public const PAY_META_KEY = '_aksrt_pay';
-		public const POST_META_KEY = 'aksrt_post_meta';
+		public const PAY_META_KEY = '_jio_pay';
+		public const POST_META_KEY = 'jio_post_meta';
 	}
 
 	final class FrontSubmitPendingProbe {
@@ -397,7 +397,7 @@ namespace AKSRT\Core {
 	}
 }
 
-namespace AKSRT\User {
+namespace Jio\User {
 	final class Restriction {
 		private static ?self $instance = null;
 		public static function get_instance(): self { return self::$instance ??= new self(); }
@@ -407,10 +407,10 @@ namespace AKSRT\User {
 }
 
 namespace {
-	use AKSRT\Attachment\PendingUploads;
-	use AKSRT\Core\FrontSubmit;
-	use AKSRT\Core\FrontSubmitPendingProbe;
-	use AKSRT\Core\DomainModel;
+	use Jio\Attachment\PendingUploads;
+	use Jio\Core\FrontSubmit;
+	use Jio\Core\FrontSubmitPendingProbe;
+	use Jio\Core\DomainModel;
 
 	$submit = new FrontSubmitPendingProbe();
 
@@ -427,7 +427,7 @@ namespace {
 		fp_assert($response instanceof \WP_REST_Response && $response->get_status() === 201, 'real upload persistence should return a created response');
 		$id = (int) ($response->get_data()['attachment_id'] ?? 0);
 		fp_assert($id > 0 && fp_pending($id), 'each normalized upload must be marked pending');
-		fp_assert(($GLOBALS['front_pending_state']['post_meta'][$id]['_aksrt_front_submit_media'] ?? '') === 'resource', 'upload should retain the normalized media type');
+		fp_assert(($GLOBALS['front_pending_state']['post_meta'][$id]['_jio_front_submit_media'] ?? '') === 'resource', 'upload should retain the normalized media type');
 	}
 	fp_assert(count($GLOBALS['front_pending_state']['upload_calls']) === 2, 'single and sideload calls should each persist once');
 	fp_assert(empty($GLOBALS['front_pending_state']['upload_calls'][0]['overrides']['action']), 'ordinary upload should use the upload action');
@@ -477,7 +477,7 @@ namespace {
 	$content = 'Draft body with enough text for a save. '
 		. '<img data-edit-file-id="100" src="/image.jpg">'
 		. '<video data-edit-file-id="101" data-video-url="https://video.example.test/movie.mp4"></video>'
-		. '<a data-aksrt-file-id="102" href="/resource.pdf">resource</a>'
+		. '<a data-jio-file-id="102" href="/resource.pdf">resource</a>'
 		. implode(' ', $body_urls);
 	$result = $submit->persist(fp_article_data($content, [
 		'fake_saved_pay_meta' => ['downloads' => $pay_downloads],
@@ -534,7 +534,7 @@ namespace {
 	fp_assert(!empty($removed['success']), 'edit removing a media reference should save');
 	fp_assert(isset($GLOBALS['front_pending_state']['posts'][441]), 'unreferenced attached media must not be deleted');
 	fp_assert($GLOBALS['front_pending_state']['posts'][441]->post_parent === 0, 'removed media should be detached from the edited post');
-	fp_assert(get_post_meta(441, '_aksrt_front_submit_media', true) === '', 'removed media should lose only its submit relation marker');
+	fp_assert(get_post_meta(441, '_jio_front_submit_media', true) === '', 'removed media should lose only its submit relation marker');
 	fp_assert(!fp_pending(441) && $GLOBALS['front_pending_state']['deleted'] === [], 'removed media must not be deleted or marked pending again');
 
 	// A payment validation error happens after the body write. The saved body is