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/jio-vip.php

@@ -425,15 +425,15 @@ if (!function_exists('jio_get_vip_purchase_url')) {
 }
 
 /**
- * 用户中心 /user/vip/ 页面的积分兑换会员入口（参考主题 zibpay_user_page_tab_content_vip 1:1）。
+ * 用户中心 /user/vip/ 页面的积分兑换会员入口。
  *
- * 参考主题在「我的会员」摘要与两张档位购买卡之后输出全宽入口横条：
- *   .c-yellow.zib-widget.flex.ac.jsb（zib-widget → 本主题 jio-panel 表面）
+ * 在「我的会员」摘要与两张档位购买卡之后输出全宽入口横条：
+ *   .c-yellow.jio-widget-box.flex.ac.jsb（jio-widget-box → 本主题 jio-panel 表面）
  *     ├─ .flex1.em12：points-color 图标 +「{自定义货币名}兑换会员」
  *     └─ .badg.radius.c-yellow：「立即兑换」+ fa-chevron-circle-right
- * 门控对齐参考主题 zibpay_get_vip_points_exchange_link：已是会员不展示
- * （$vip_level ? '' : link），且要求积分兑换会员开启、至少一个会员等级
- * 开启并存在可兑换套餐（catalog.points_exchange 已内含 credits 门控）。
+ * 门控：已是会员不展示（$vip_level ? '' : link），且要求积分兑换会员开启、
+ * 至少一个会员等级开启并存在可兑换套餐（catalog.points_exchange 已内含
+ * credits 门控）。
  *
  * 入口文案的货币名取 catalog.currency_name（后台「积分配置 → 自定义货币名称」），
  * 与它打开的兑换弹窗标题、会员弹窗内的入口保持同一命名。