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-creator.php

@@ -2,9 +2,8 @@
 /**
  * User center sidebar: creator center / promotion center cards.
  *
- * 1:1 port of the reference theme zib_user_center_page_sidebar_income_rebate():
- * two zib-widget cards, each with an icon title row and two centered stats.
- * Navigation keeps the Jio <a href data-tab> contract instead of the reference click proxy.
+ * Two jio-widget-box cards, each with an icon title row and two centered stats.
+ * Navigation uses the Jio <a href data-tab> contract.
  *
  * @package Jio
  */
@@ -36,7 +35,7 @@ if ($creation_url !== '') {
 	$centers[] = [
 		'url'      => $creation_url,
 		'tab'      => 'creator',
-		'icon'     => jio_icon_markup('zibsvg-merchant-color', 'mr6'),
+		'icon'     => jio_icon_markup('jiosvg-merchant-color', 'mr6'),
 		'title'    => __('创作中心', 'jio'),
 		'first'    => jio_cut_count($cash_income),
 		'first_l'  => __('现金收益', 'jio'),
@@ -64,7 +63,7 @@ if ($revenue_url !== '') {
 	$centers[] = [
 		'url'      => $revenue_url,
 		'tab'      => 'revenue',
-		'icon'     => jio_icon_markup('zibsvg-money-color', 'mr6'),
+		'icon'     => jio_icon_markup('jiosvg-money-color', 'mr6'),
 		'title'    => __('推广中心', 'jio'),
 		'first'    => $rebate_ratio . '%',
 		'first_l'  => __('比例', 'jio'),
@@ -75,7 +74,7 @@ if ($revenue_url !== '') {
 ?>
 <div class="uc-sidebar-centers flex ab jsb col-ml6<?php echo $user_id <= 0 ? ' signin-loader' : ''; ?>">
 	<?php foreach ($centers as $center) : ?>
-		<a style="flex: 1;" class="mb10-sm zib-widget padding-10 flex1 pointer" href="<?php echo esc_url($center['url']); ?>" data-tab="<?php echo esc_attr($center['tab']); ?>">
+		<a style="flex: 1;" class="mb10-sm jio-widget-box padding-10 flex1 pointer" href="<?php echo esc_url($center['url']); ?>" data-tab="<?php echo esc_attr($center['tab']); ?>">
 			<div class="muted-color em09 mb6 flex ac"><div class="overflow-hidden"><div class="text-ellipsis"><?php echo $center['icon']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?><?php echo esc_html($center['title']); ?></div></div><i class="ml6 fa fas fa-angle-right em12" aria-hidden="true"></i></div>
 			<div class="flex jsa text-center"><div class=""><div class="font-bold em12"><?php echo esc_html($center['first']); ?></div><div class="px12 opacity5"><?php echo esc_html($center['first_l']); ?></div></div><div class="overflow-hidden"><div class="font-bold em12"><?php echo esc_html($center['second']); ?></div><div class="px12 opacity5 text-ellipsis"><?php echo esc_html($center['second_l']); ?></div></div></div>
 		</a>