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/routes/user-home.css

@@ -281,7 +281,7 @@
   color: var(--color-ink-3);
 }
 
-/* 内容区卡片 — Zibll .author-tab.zib-widget parity（padding 15px / radius 8px） */
+/* 内容区卡片 — .author-tab.jio-widget-box parity（padding 15px / radius 8px） */
 .jio-user-home .dashboard--public {
   max-width: none;
   background: var(--main-bg-color, #fff);
@@ -291,7 +291,7 @@
   border: none;
 }
 
-/* Tab 栏 — Zibll .author-tab .tab-nav-theme parity：纯文字导航、
+/* Tab 栏 — .author-tab .tab-nav-theme parity：纯文字导航、
  * 激活项加粗 + 主题色 + 20px 短横线，计数为小号内联文字。 */
 .jio-user-home .dashboard--public .dashboard-tabs {
   display: flex;
@@ -368,16 +368,16 @@
   animation: panel-fade-in 0.25s ease;
 }
 
-/* Public author posts/favorites follow Zibll's author-tab list
- * (zibll css/main.css: .author-tab .posts-item + the ≥992px no-sidebar
+/* Public author posts/favorites follow the author-tab list
+ * (.author-tab .posts-item + the ≥992px no-sidebar
  * two-column rule .site-layout-1 .posts-item:not(.card)). */
 .jio-user-home .jio-user-home__post-list[data-view="list"] .posts-item {
   background: transparent;
   box-shadow: none;
 }
 
-/* 宽屏双列：无侧边栏全文宽时文章卡片并排两列，视觉同 zibll site-layout-1
- * （zibll 用 inline-flex+calc(50%)，对标记空白敏感，此处用等几何的 grid） */
+/* 宽屏双列：无侧边栏全文宽时文章卡片并排两列，视觉同 site-layout-1
+ * （原实现对标记空白敏感，此处用等几何的 grid） */
 @media (min-width: 992px) {
   .jio-user-home .jio-user-home__post-list[data-view="list"] {
     display: grid;
@@ -474,11 +474,10 @@
   }
 }
 
-/* User-home follow tab — Zibll parity
- * 子切换复刻 zibll inc/functions/zib-author.php:407-410（list-inline splitters
- * 居中文字链接，激活 focus-color）；列表项为 .author-minicard inline-block
- * 三列卡片流（卡片规则、640px 单列均在 vendored main.css），容器居中对齐
- * zibll pane 的 text-center。 */
+/* User-home follow tab
+ * 子切换为居中文字链接（list-inline splitters，激活 focus-color）；列表项为
+ * .author-minicard inline-block 三列卡片流（卡片规则、640px 单列均在 vendored
+ * main.css），容器居中对齐 pane 的 text-center。 */
 .jio-user-home .uh-follow__subtabs {
     display: flex;
     justify-content: center;