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/vip-tab.php

@@ -118,7 +118,7 @@ foreach ([1, 2] as $lv) {
 		: '';
 	$cta      = __('开通', 'jio') . wp_kses_post($lv_name);
 	$vip_attr = $lv;
-	// 参考主题 zibpay_get_vip_card：续费/升级档位卡展示各自的一句话简介。
+	// 续费/升级档位卡展示各自的一句话简介。
 	$card_action = 'pay';
 	$card_desc   = $lv_desc;
 	$lv_icon_url = esc_url((string) ($levels[$lv]['img_icon'] ?? ''));
@@ -182,8 +182,8 @@ foreach ([1, 2] as $lv) {
 	</div>
 
 	<?php
-	// 积分兑换会员入口（参考主题 zibpay_user_page_tab_content_vip 1:1：档位购买卡
-	// 下方的全宽横条；仅非会员 + 积分兑换开启 + 有可兑换套餐时输出）。
+	// 积分兑换会员入口（档位购买卡下方的全宽横条；
+	// 仅非会员 + 积分兑换开启 + 有可兑换套餐时输出）。
 	echo jio_get_vip_points_exchange_entry_html($user_id, $level); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- 各字段已在生成时转义。
 	?>
 </div>