chore(branding): remove leftover upstream theme identifiers

The theme was renamed Zibll/子比 → AKSRT → Jio, but upstream branding
survived the sweeps in CSS classes, the SVG sprite prefix, a persisted
widget field ID, JS events, admin Vue class names, test infrastructure
and docblocks.

Renames:
- zib-widget / zib-widget-wrap / zib-slider → jio-widget-box /
  jio-widget-box-wrap / jio-slider-box (jio-widget is taken by the modern
  widget shell, jio-box-* by the card primitives)
- zib-partners-scroll + zps-* → jio-partners-scroll + jps-*
- zib-combo-info-card + zci-* → jio-combo-info-card + jci-*
- zibsvg- → jiosvg-, including the exported picker helpers and the
  fa-zibsvg- family-prefix guard
- zibpay_type → pay_type; the dual-read fallback in PostQuery collapses
  to a single key
- [zibajax="submit"] dropped (no PHP emitter); zib_ajax.success →
  jio_ajax.success
- aks-* admin Vue classes → jio-*
- zib_palette() → palette()

User-facing vendor traces are gone: the floating "more" button default no
longer ships a zibll.com link or 子比主题 marketing copy, the notice
widget ships no preset promo entries, and the four 官网教程 links are
removed from the post-list admin schema.

Test infrastructure renamed to neutral names (docker-compose.reference.yml,
Caddyfile, article-baseline.json, modern-widgets-contract.test.cjs) with
their DB/volume/env/slug identifiers following.

Kept intentionally, documented in tests/fixtures/README.md: the golden
fixture reference fingerprint (a SHA-256 record of an external directory,
read by validate-widget-golden / generate-widget-golden-fixture /
audit-widget-system), the doesNotMatch guards that prove the old tokens are
gone, and the reference theme's own meta key in the visual fixtures.

No backward-compat or data migration: saved widget configs holding old
icon keys or the old field ID silently lose them, per the project's
rewrite-over-compatibility rule.

Verified: 132/132 node contract tests, php tests/widget-system/run.php
(146 assertions), audit-admin-contracts, audit-psr4-paths and
validate-widget-golden all green; tracked bundles regenerated and in sync.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

inc/helpers/user-center-renderers/sidebar-nav.php

@@ -19,7 +19,7 @@ $orders_url = $orders_available ? (string) ($orders_url ?? '') : '';
 $tickets_available = isset($dashboard_tabs['tickets']);
 $tickets_url = $tickets_available ? jio_get_user_center_tab_url('tickets') : '';
 
-// 参考主题由 zibpay 把「我的订单」前插到按钮组最前，其后才是等级 / 认证。
+// 「我的订单」位于按钮组最前，其后才是等级 / 认证。
 $services = array_values(array_filter([
 	[
 		'label' => __('我的订单', 'jio'),
@@ -74,7 +74,7 @@ $render_grid = static function (array $items): void {
 		<?php foreach ($items as $item) :
 			$tab = (string) ($item['tab'] ?? '');
 			$item_class = 'icon-but-' . ($tab !== '' ? $tab : 'item');
-			$icon_html = jio_icon_markup('zibsvg-' . (string) $item['icon']);
+			$icon_html = jio_icon_markup('jiosvg-' . (string) $item['icon']);
 		?>
 			<a class="<?php echo esc_attr($item_class); ?>" href="<?php echo esc_url((string) $item['url']); ?>"<?php if ($tab !== '') : ?> data-tab="<?php echo esc_attr($tab); ?>"<?php endif; ?>>
 				<div class="em16"><?php echo $icon_html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?></div>
@@ -86,14 +86,14 @@ $render_grid = static function (array $items): void {
 };
 ?>
 <?php if ($services) : ?>
-<div class="uc-sidebar-iconbox zib-widget padding-6 mb10-sm">
+<div class="uc-sidebar-iconbox jio-widget-box padding-6 mb10-sm">
 	<div class="padding-6 ml3"><?php esc_html_e('我的服务', 'jio'); ?></div>
 	<?php $render_grid($services); ?>
 </div>
 <?php endif; ?>
 
 <?php if ($settings) : ?>
-<div class="uc-sidebar-iconbox zib-widget padding-6">
+<div class="uc-sidebar-iconbox jio-widget-box padding-6">
 	<div class="padding-6 ml3"><?php esc_html_e('功能设置', 'jio'); ?></div>
 	<?php $render_grid($settings); ?>
 </div>