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>

src/WidgetSystem/Renderers/ContentRenderer.php

@@ -35,7 +35,7 @@ final class ContentRenderer {
 		}
 		$inner = self::ajaxpager($instance, $slug, $widget_id, 1, '');
 		$html = '<div class="widget-main-post mb20 style-' . esc_attr($style) . '">';
-		$html .= $style === 'mini' ? '<div class="zib-widget posts-mini-lists">' : '';
+		$html .= $style === 'mini' ? '<div class="jio-widget-box posts-mini-lists">' : '';
 		$html .= $inner;
 		$html .= $style === 'mini' ? '</div>' : '';
 		return $html . '</div>';
@@ -102,7 +102,7 @@ final class ContentRenderer {
 			$visible_index++;
 		}
 		if ($buttons === '') return '';
-		return '<div class="widget-tab-post style-' . esc_attr($style) . ($style === 'mini' ? ' posts-mini-lists zib-widget' : ' index-tab relative-h') . '" data-widget="tab_posts" data-instance="' . esc_attr($widget_id) . '"><div class="relative' . ($style === 'card' ? ' mb20' : '') . '"><ul class="list-inline scroll-x no-scrollbar' . ($style === 'mini' ? ' tab-nav-theme' : '') . '" role="tablist">' . $buttons . '</ul></div><div class="tab-content">' . $panels . '</div></div>';
+		return '<div class="widget-tab-post style-' . esc_attr($style) . ($style === 'mini' ? ' posts-mini-lists jio-widget-box' : ' index-tab relative-h') . '" data-widget="tab_posts" data-instance="' . esc_attr($widget_id) . '"><div class="relative' . ($style === 'card' ? ' mb20' : '') . '"><ul class="list-inline scroll-x no-scrollbar' . ($style === 'mini' ? ' tab-nav-theme' : '') . '" role="tablist">' . $buttons . '</ul></div><div class="tab-content">' . $panels . '</div></div>';
 	}
 
 	private static function term_cards(array $instance): string {