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/icon-card-contract.test.cjs

@@ -53,10 +53,10 @@ test('widget icon cards restore the reference surface height without compact ove
 
   assert.match(
     widgetCss,
-    /\.zib-widget\s*\{[^}]*margin-bottom:\s*20px[^}]*padding:\s*15px[^}]*box-shadow:\s*0 0 10px/s,
+    /\.jio-widget-box\s*\{[^}]*margin-bottom:\s*20px[^}]*padding:\s*15px[^}]*box-shadow:\s*0 0 10px/s,
   );
-  assert.match(widgetCss, /\.zib-widget\.padding-10\s*\{\s*padding:\s*10px/);
-  assert.match(widgetCss, /\.zib-widget\.nobottom\.notop\s*\{[^}]*padding-top:\s*0[^}]*padding-bottom:\s*0/s);
+  assert.match(widgetCss, /\.jio-widget-box\.padding-10\s*\{\s*padding:\s*10px/);
+  assert.match(widgetCss, /\.jio-widget-box\.nobottom\.notop\s*\{[^}]*padding-top:\s*0[^}]*padding-bottom:\s*0/s);
   assert.doesNotMatch(widgetCss, /\.row\.gutters-5/);
   assert.doesNotMatch(widgetCss, /\.icon-card\s*,\s*\.icon-cover-card\s*\{\s*font-size:\s*12px/);
   assert.doesNotMatch(widgetCss, /\.icon-cover-card\s*\{[^}]*padding-(?:top|bottom)/s);
@@ -70,7 +70,7 @@ test('header icon-card defaults use bundled Font Awesome icons', () => {
   ];
 
   for (const source of defaults) {
-    assert.doesNotMatch(source, /'icon'\s*=>\s*'zibsvg-/);
+    assert.doesNotMatch(source, /'icon'\s*=>\s*'jiosvg-/);
     for (const icon of ['gem', 'star', 'fire', 'wrench']) {
       assert.match(source, new RegExp(`'icon'\\s*=>\\s*'fa fas fa-${icon}'`));
     }
@@ -85,15 +85,15 @@ test('icon card renderers route every picker format through the shared icon rend
   assert.match(helper, /if \(function_exists\('jio_icon_markup'\)\) \{\s*return jio_icon_markup\(\$value, \$extra\);/s);
 
   // Both renderers must delegate: emitting a bare FA class string produced
-  // `<i class="fa fas fa-zibsvg-hot">`, i.e. an invisible glyph, for the two
+  // `<i class="fa fas fa-jiosvg-hot">`, i.e. an invisible glyph, for the two
   // SVG formats the admin picker can store.
   assert.match(helper, /\$icon_inner = jio_card_icon_inner\(\$icon_fa, 'em09'\);/);
   assert.match(helper, /\$icon_inner = jio_card_icon_inner\(\$icon_fa\);/);
 
   // The picker prefixes must drive the SVG branches, and the stale
-  // `jiosvg-` prefix (never emitted by any picker) must be gone.
-  assert.match(helper, /str_starts_with\(\$value, 'zibsvg-'\) \|\| str_starts_with\(\$value, 'customsvg-'\)/);
-  assert.doesNotMatch(helper, /jiosvg-/);
+  // `zibsvg-` prefix (never emitted by any picker) must be gone.
+  assert.match(helper, /str_starts_with\(\$value, 'jiosvg-'\) \|\| str_starts_with\(\$value, 'customsvg-'\)/);
+  assert.doesNotMatch(helper, /zibsvg-/);
   assert.doesNotMatch(helper, /'fa fas fa-'\s*\.\s*\$icon_fa/);
   assert.doesNotMatch(helper, /<i class="'\s*\.\s*esc_attr\(\$icon_fa\)\s*\.\s*' em09"/);
 });