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/user-card-runtime-contract.test.cjs

@@ -15,7 +15,7 @@ test('user and author widgets render the reference state contract', () => {
   assert.equal(result.status, 0, result.stderr || result.stdout)
   const data = JSON.parse(result.stdout)
 
-  assert.match(data.guest, /^<div class="mb20"><div class="user-card zib-widget widget">/)
+  assert.match(data.guest, /^<div class="mb20"><div class="user-card jio-widget-box widget">/)
   assert.match(data.guest, /data-lazy-type="lazy_other"/)
   assert.match(data.guest, /alt="默认头像"/)
   assert.match(data.guest, /<div class="user-info mt10"><div class="text-center"><p class="muted-color box-body em12">/)
@@ -26,7 +26,9 @@ test('user and author widgets render the reference state contract', () => {
   assert.match(data.guest, /class="social-login-item github toggle-radius"/)
   assert.match(data.guest, /class="social-login-item qq toggle-radius" data-provider="clogin_qq"/)
   assert.match(data.guest, /title="GitHub登录"/)
-  assert.doesNotMatch(data.guest, /jio-widget|jio-panel-wrap|user-card__auth-btns|oauth-row|oauth-btn/)
+  // The reference user card keeps its own shell; it must not adopt the modern
+  // widget shell (jio-widget / jio-panel-wrap) or the OAuth button components.
+  assert.doesNotMatch(data.guest, /class="[^"]*\bjio-widget(?![\w-])|jio-panel-wrap|user-card__auth-btns|oauth-row|oauth-btn/)
   // The social-login area carries no agreement copy; the reference guest card
   // only shows the separator, the .social_loginbar and the provider buttons.
   assert.doesNotMatch(data.guest, /我已阅读并同意|使用社交账号登录即表示|注册即表示/)
@@ -35,7 +37,7 @@ test('user and author widgets render the reference state contract', () => {
   assert.doesNotMatch(data.guest_no_registration, /signup-loader/)
   assert.equal(data.closed, '')
 
-  assert.match(data.logged, /^<div class="mb20"><div class="user-card zib-widget widget">/)
+  assert.match(data.logged, /^<div class="mb20"><div class="user-card jio-widget-box widget">/)
   assert.match(data.logged, /data-lazy-type="lazy_cover"/)
   assert.match(data.logged, /<div class="card-content mt10 relative">/)
   assert.match(data.logged, /<div class="user-name flex jc">/)
@@ -47,7 +49,7 @@ test('user and author widgets render the reference state contract', () => {
   assert.match(data.logged_buttons, /rel="nofollow" href="https:\/\/example\.test\/user-center" class="but pw-1em ml6 jb-blue">用户中心<\/a>/)
   assert.doesNotMatch(data.logged_buttons, /<icon|<text>/)
 
-  assert.match(data.author, /^<div class="mb20"><div class="user-card zib-widget widget">/)
+  assert.match(data.author, /^<div class="mb20"><div class="user-card jio-widget-box widget">/)
   assert.match(data.author, /data-lazy-type="lazy_cover"/)
   assert.match(data.author, /data-post-type="post" data-post-style="card"/)
   assert.doesNotMatch(data.author, /user-btns mt20/)