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/pay-card-contract.test.cjs

@@ -8,15 +8,15 @@ const test = require('node:test');
 const root = path.resolve(__dirname, '..', '..');
 const read = (file) => fs.readFileSync(path.join(root, file), 'utf8');
 
-test('paid article and sidebar widget use the Zibll purchase-card DOM', () => {
+test('paid article and sidebar widget use the purchase-card DOM', () => {
   const pay = read('inc/helpers/jio-pay.php');
   const widget = read('src/WidgetSystem/Renderers/ContentRenderer.php');
   const shell = read('src/WidgetSystem/FrontendRenderer.php');
   const single = read('inc/helpers/jio-single-render.php');
   const hooks = read('inc/core-hooks.php');
 
-  assert.match(pay, /zib-widget pay-box pay-widget/);
-  assert.match(pay, /zib-widget pay-box order-type-/);
+  assert.match(pay, /jio-widget-box pay-box pay-widget/);
+  assert.match(pay, /jio-widget-box pay-box order-type-/);
   assert.match(pay, /flex pay-flexbox/);
   assert.match(pay, /hide-sm pay-thumb/);
   assert.match(pay, /pay-tag abs-center/);
@@ -38,7 +38,7 @@ test('paid article and sidebar widget use the Zibll purchase-card DOM', () => {
   assert.doesNotMatch(pay, /jio_get_user_center_tab_url\('vip'\)/);
   assert.match(pay, /cashier-link/);
   assert.match(pay, /function jio_get_paid_box_html/);
-  assert.match(pay, /pay-box zib-widget paid-box order-type-/);
+  assert.match(pay, /pay-box jio-widget-box paid-box order-type-/);
   assert.match(pay, /flex ac jb-green padding-10 em09/);
   assert.match(pay, /订单号/);
   assert.doesNotMatch(pay, /'流水号'/);
@@ -65,7 +65,7 @@ test('the purchase card owns one direct stylesheet and no retired paywall path',
 
   assert.match(assets, /assets\/css\/frontend\/pay-box\.css|\'pay-box\'/);
   assert.match(shortcodes, /return jio_get_paywall_html\(\$post, \['message' => \$message\]\);/);
-  assert.match(css, /\.zib-widget\.pay-box/);
+  assert.match(css, /\.jio-widget-box\.pay-box/);
   assert.match(css, /\.pay-box \.pay-vip-level-icon/);
   assert.match(css, /\.pay-box \.pay-vip-exclusive/);
   assert.doesNotMatch(css, /@media/);