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/frontend-lifecycle-contract.test.cjs

@@ -146,11 +146,11 @@ test('homepage tabs refresh the original pane DOM through the runtime post_ajax
   const homepage = read('inc/helpers/jio-homepage.php')
   const controller = read('src/Admin/GlobalController.php')
 
-  // legacy zib_index_tab_html 契约：data-toggle="tab" + data-ajax 栏目链接。
+  // 栏目链接契约：data-toggle="tab" + data-ajax。
   assert.match(layout, /<a data-toggle="tab" data-ajax="/)
   assert.match(layout, /href="#index-tab-main"/)
   assert.match(layout, /class="index-tab affix-header-sm relative home-tab-nav-box mb10" offset-top="-8"/)
-  // pane 本身是原位刷新容器：zib_index_tab('content') 契约。
+  // pane 本身是原位刷新容器。
   assert.match(layout, /class="posts-row ajaxpager tab-pane fade in active" id="index-tab-main"/)
   assert.match(layout, /class="ajaxpager tab-pane fade" id="index-tab-/)
   assert.match(layout, /<span class="post_ajax_trigger"><a class="ajax_load ajax-next ajax-open" href="/)
@@ -162,12 +162,12 @@ test('homepage tabs refresh the original pane DOM through the runtime post_ajax
   assert.doesNotMatch(layout, /data-home-tab-panel|jio-homepage__panel|jio-homepage__tab|requestHomepagePanel|data-sticky-tabs/)
   assert.doesNotMatch(controller, /homepage\/tab-posts|rest_homepage_tab_posts/)
 
-  // 排序菜单 = zib_ajax_option_menu('home') 契约：win-ajax-replace="filter" + ajax-next 链接。
+  // 排序菜单契约：win-ajax-replace="filter" + ajax-next 链接。
   assert.match(homepage, /function jio_homepage_render_ajax_option_menu/)
   assert.match(homepage, /win-ajax-replace="filter"/)
   assert.match(homepage, /ajax-replace="true" class="' \. esc_attr\(\$_class\)/)
   assert.match(homepage, /!empty\(\$_GET\['nofilter'\]\)/)
-  // 主查询吃 ?orderby=（legacy zib_sift_posts_per_orde），排序原位刷新才有效。
+  // 主查询吃 ?orderby=，排序原位刷新才有效。
   assert.match(homepage, /function jio_homepage_get_request_sort/)
   assert.match(read('inc/helpers/homepage/content.php'), /jio_homepage_get_request_sort\(\)/)
 
@@ -198,9 +198,9 @@ test('modal fragment lifecycle reruns auto_fun after loaded.bs.modal', () => {
   assert.match(source, /loaded\.bs\.modal[\s\S]*?auto_fun/);
 });
 
-test('JSON success lifecycle remains zib_ajax.success', () => {
+test('JSON success lifecycle remains jio_ajax.success', () => {
   const source = read('assets/js/runtime/main.js');
-  assert.match(source, /zib_ajax\.success/);
+  assert.match(source, /jio_ajax\.success/);
 });
 
 test('Miniimgbox owns data-imgbox and lazySizes has one integration owner', () => {