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>

assets/css/frontend/modal-runtime.css

@@ -286,8 +286,8 @@ body.jio-modal-runtime-open {
   transition: opacity 0.15s ease;
 }
 
-/* ---- 禁封用户弹窗（参考主题 set_user_ban 模态框几何 1:1）----
-   参考主题 zib_get_edit_user_ban_link 未传 data-class → 走 Bootstrap 默认
+/* ---- 禁封用户弹窗（set_user_ban 模态框几何 1:1）----
+   编辑入口未传 data-class → 走 Bootstrap 默认
    .modal-dialog（>=768px 宽 600px）；data-height=360 → .modal-content 初始
    高度 360 后动画至内容高度；mobile-bottom → <769px 底部抽屉。
    此处以 min-height:360px 复刻初始高度契约，桌面宽取 600px。 */
@@ -339,7 +339,7 @@ body.jio-modal-runtime-open {
   padding: 2px 6px;
 }
 
-/* 解封视图多彩横幅（参考主题 zib_get_modal_colorful_header('c-yellow', ...)）：
+/* 解封视图多彩横幅（多彩横幅头契约：c-yellow 配色变体）：
    120px 高绝对定位横幅 + 旋转彩斑，后续表单整体下移 120px。 */
 .jio-user-ban-modal .modal-colorful-header,
 .jio-user-ban-modal .colorful-bg,