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>

src/Admin/Native/AdminListPagination.php

@@ -2,7 +2,7 @@
 /**
  * @package Jio
  *
- * 后台列表页分页条 —— 1:1 复刻「卡密管理」页的 zibpay_admin_pagenavi 结构。
+ * 后台列表页分页条 —— 沿用「卡密管理」页的翻页结构。
  *
  * 支付中心各页面（订单明细 / 付费文章 / 优惠码 / 创作分成 / 提现审核 / 卡密管理）
  * 原先各写一份几乎相同的翻页代码。这里统一到一处，标记沿用卡密管理那一套：

src/Admin/Native/PayChargeCards.php

@@ -2,12 +2,12 @@
 /**
  * @package Jio
  *
- * 后台「卡密管理」页面 — 1:1 复刻参考主题 zibll 的 zibpay/page/charge-card.php。
+ * 后台「卡密管理」页面。
  *
  * 结构：列表（过滤/搜索/排序/批量删除/分页） + 添加卡密（自动生成 / 导入） + 导出卡密（text / xls）。
- * 卡密类型与参考主题一致：余额充值 / 会员兑换 / 积分兑换 / 自定义卡密；
+ * 卡密类型：余额充值 / 会员兑换 / 积分兑换 / 自定义卡密；
  * 本主题内部类型映射：balance / vip / credits / custom。
- * 差异点：Jio 无商城发货（shipped）子系统，故不含「已售」标记与链接；删除取代参考主题的批量操作语义一致。
+ * 差异点：Jio 无商城发货（shipped）子系统，故不含「已售」标记与链接。
  *
  * 外壳与配色走 NativeUi（.jio-native），页面专属交互样式仍由 print_assets() 输出。
  * 类体按关注点拆成 flat sibling traits（PSR-4 要求 trait 与宿主类同目录，不能放子目录）：
@@ -114,7 +114,7 @@ class PayChargeCards {
     }
 
     /**
-     * 导出处理（参考主题 zibpay_ajax_card_pass_export 同款行为）。
+     * 导出处理。
      */
     public function handle_export(): void {
         if (!current_user_can(self::CAPABILITY)) {
@@ -193,7 +193,7 @@ class PayChargeCards {
     }
 
     /**
-     * 导出 xls（参考主题 zib_export_excel 同款行为，GB2312 编码保证 Excel 兼容）。
+     * 导出 xls（GB2312 编码保证 Excel 兼容）。
      *
      * @param array<int,array<int,string>> $data
      * @param array<int,string> $title