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/navigation/header-reference-contract.test.cjs

@@ -114,7 +114,7 @@ test('account icons keep the reference spacing on both sides of each divider', (
   for (const html of lists) {
     const account = html.match(/<ul class="list-inline splitters relative">([\s\S]*?)<\/ul><\/div>/);
     assert.ok(account, 'missing the account action list');
-    // Reference zib_menu_button concatenates the items directly. Whitespace
+    // The reference menu button concatenates the items directly. Whitespace
     // between inline-block li elements adds a font-dependent gap before the
     // following item's divider, beyond the shared 5px li / 12px button padding.
     assert.doesNotMatch(account[1], /<\/li>\s+<li\b/, 'extra text space shifts the divider');

tests/navigation/legacy-navigation-contract.test.cjs

@@ -115,9 +115,9 @@ test('Font Awesome 5 is the only icon contract across every runtime path', () =>
     'fa-chevron', 'fa-icon', 'fa-icon-picker', 'fa-icons', 'fa-input',
     'fa-mask', 'fa-spin-hover', 'fa-toggle-theme', 'fa-xxx',
   ]);
-  // The theme ships its own SVG sprite family, so fa-zibsvg-<key> is a project
+  // The theme ships its own SVG sprite family, so fa-jiosvg-<key> is a project
   // icon rather than a Font Awesome glyph — allow the prefix instead of every key.
-  const projectFamily = /^fa-zibsvg-/;
+  const projectFamily = /^fa-jiosvg-/;
 
   assert.doesNotMatch(runtime, /\bfa fa-/);
   assert.doesNotMatch(runtime, /FontAwesome|font-awesome\.min\.css|Font Awesome 4|4\.7\.0/);
@@ -245,8 +245,8 @@ test('the account popover rows match the reference user box structure', () => {
   assert.match(header, /muted-box padding-6 flex1 radius4/);
   assert.match(header, /font-bold c-blue-2/);
   assert.match(header, /font-bold c-yellow/);
-  assert.match(header, /jio_icon_markup\('zibsvg-money-color-2', 'em14'\)/);
-  assert.match(header, /jio_icon_markup\('zibsvg-points-color', 'em14'\)/);
+  assert.match(header, /jio_icon_markup\('jiosvg-money-color-2', 'em14'\)/);
+  assert.match(header, /jio_icon_markup\('jiosvg-points-color', 'em14'\)/);
   // The value icons are the reference theme's multi-tone SVGs, not FA5 glyphs;
   // the tile arrow stays on fa-angle-right exactly as the reference renders it.
   assert.doesNotMatch(header, /fa fas fa-money-bill-wave/);