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>

tests/widget-system/vip-points-exchange-modal.test.cjs

@@ -5,10 +5,10 @@
  * 1) 服务端静态输出参考主题 refresh_modal 同构壳（`modal flex jc fade` >
  *    `modal-dialog modal-mini full-sm` > `modal-content` > `modal-body`）。
  *    入口有两处，分别对应参考主题的两个变体：
- *    - 会员购买弹窗内（zibpay_get_pay_uservip_modal 的
+ *    - 会员购买弹窗内（参考实现的会员购买弹窗的
  *      `btn-block but mb10 padding-lg c-green mini-radius` 按钮）；
- *    - /user/vip/ 档位购买卡下方（zibpay_user_page_tab_content_vip 的
- *      `c-yellow zib-widget flex ac jsb` 全宽横条，仅非会员展示）。
+ *    - /user/vip/ 档位购买卡下方（参考实现的会员页 tab 的
+ *      `c-yellow jio-widget-box flex ac jsb` 全宽横条，仅非会员展示）。
  *    两处入口均带 data-jio-vip-points-open，由 pay-vip.js 文档级委托打开
  *    同一静态弹窗。
  * 2) 静止态必须被 vip-modal.css 显式隐藏（.flex 覆盖回归护栏），打开态为
@@ -169,7 +169,7 @@ test('开关自包含：不依赖 jQuery/Bootstrap modal 运行时', () => {
 });
 
 test('会员弹窗内的入口为参考主题同款按钮并开本地弹窗', () => {
-  // 参考主题 zibpay_get_pay_uservip_modal 的 class 与图标顺序。
+  // 参考实现的会员购买弹窗的 class 与图标顺序。
   assert.match(vipJs, /node\("a", "btn-block but mb10 padding-lg c-green mini-radius"\)/);
   assert.match(vipJs, /#icon-points-color/);
   // 图标顺序与 class 串保持参考主题一致；FA5 样式类 `fas` 由图标契约（
@@ -180,8 +180,8 @@ test('会员弹窗内的入口为参考主题同款按钮并开本地弹窗', ()
 });
 
 test('/user/vip/ 档位购买卡下方的入口为参考主题用户中心同款横条', () => {
-  // 参考主题 zibpay_user_page_tab_content_vip：my_box → vip_card → points link，
-  // 横条为 `c-yellow zib-widget flex ac jsb`（zib-widget → 本主题jio-panel表面）。
+  // 会员页 tab：my_box → vip_card → points link，
+  // 横条为 `c-yellow jio-widget-box flex ac jsb`（jio-widget-box → 本主题jio-panel表面）。
   assert.match(footer, /function jio_get_vip_points_exchange_entry_html/);
   assert.match(vipTab, /jio_get_vip_points_exchange_entry_html\(\$user_id, \$level\)/);
   // 结构 1:1：左 points-color 图标 + 标题（flex1 em12 c-yellow），
@@ -195,7 +195,7 @@ test('/user/vip/ 档位购买卡下方的入口为参考主题用户中心同款
 });
 
 test('/user/vip/ 入口门控与弹窗壳同源：非会员 + 兑换开启 + 有可兑换套餐', () => {
-  // 参考主题 zibpay_get_vip_points_exchange_link 门控：已是会员不展示。
+  // 已是会员不展示积分兑换入口。
   assert.match(footer, /if \(\$vip_level > 0\) \{\s*return '';/);
   // 可用性直接取服务端 catalog（内含 credits 门控与等级启用过滤），
   // 与 wp_footer 弹窗壳的渲染条件一致，避免出现无弹窗可开的死入口。