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/post-visual-contract.test.cjs

@@ -242,7 +242,7 @@ test('related posts, author page and widgets use their dedicated renderers', ()
   assert.match(related, /<li><a class="icon-circle"/);
   assert.match(related, /\['category', 'topics', 'post_tag'\]/);
   assert.match(related, /'terms'\s+=>\s+array_map\('intval', \(array\) \$term_ids\)/);
-  assert.match(related, /class=\"zib-widget\"/);
+  assert.match(related, /class=\"jio-widget-box\"/);
   assert.doesNotMatch(related, /post_related_source/);
   assert.doesNotMatch(related, /post__not_in/);
   assert.match(related, /\$args\['meta_key'\]\s*=\s*'jio_post_views'/);
@@ -321,7 +321,7 @@ test('after-box author card mirrors legacy user-card structure', () => {
   assert.match(userCard, /swiper-container more-posts swiper-scroll/);
   assert.match(userCard, /'class'\s+=>\s+'em09', 'cut'\s+=>\s+32/);
   assert.doesNotMatch(userCard, /jio-more-post-card/);
-  assert.match(css, /^\.zib-widget \{/m);
+  assert.match(css, /^\.jio-widget-box \{/m);
   assert.doesNotMatch(css, /relates-thumb \.graphic\.style-3 \.graphic-img/);
   assert.doesNotMatch(authorActions, /\.user-card-author|\.user-card \.author|user-card-posts/);
   assert.match(identity, /function jio_get_user_follow\(/);
@@ -354,7 +354,7 @@ test('AJAX pagination can recover, caps auto loading and rehydrates appended med
   assert.doesNotMatch(php, /next-page ajax-next/);
   assert.match(php, /lazyload-action="ias"/);
   assert.match(js, /lazybeforeunveil/);
-  // 1:1 对齐参考主题 zib_paging()：.ajax-pag 内只渲染翻页控件，不预渲染 loader。
+  // .ajax-pag 内只渲染翻页控件，不预渲染 loader。
   // 预渲染的 loader 会被 runtime post_ajax() 复用并丢弃动态骨架，导致排序切换
   // 永远是写死 2 条 list 骨架。骨架改由 pagination.js 在请求时按视口创建。
   assert.doesNotMatch(php, /post_ajax_loader/);
@@ -391,8 +391,8 @@ test('front-end carousel CSS is conditional on carousel block content', () => {
 });
 
 test('the pinned visual baseline records all source checksums', () => {
-  const baseline = JSON.parse(read('tests/visual/zibll-9.0-article-baseline.json'));
-  assert.equal(baseline.theme, 'Zibll');
+  const baseline = JSON.parse(read('tests/visual/article-baseline.json'));
+  assert.equal(baseline.theme, 'reference');
   assert.equal(baseline.version, '9.0');
   const files = Object.values(baseline.files);
   assert.ok(files.length >= 6);
@@ -868,7 +868,7 @@ test('content max width is one contract from admin option to runtime var', () =>
   const themeSearch = read('src/Settings/ThemeSearch.php');
   const builder = read('src/Frontend/InlineStyleBuilder.php');
 
-  // Free number input (zibll layout_max_width parity): UI range, REST validation
+  // Free number input: UI range, REST validation
   // and runtime clamp must agree, or saves are rejected / silently clamped.
   const vueField = layoutSchema.match(/key: 'container_max_width'[^\n]*/)[0];
   assert.match(vueField, /type: 'number'/);