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>

inc/helpers/user-center-renderers/sidebar-vip.php

@@ -2,10 +2,9 @@
 /**
  * User center sidebar: VIP entry.
  *
- * 1:1 port of the reference theme zib_user_center_page_sidebar_vip():
- * metallic payvip-icon bar, level icon + name + expiry badge for members,
+ * Metallic payvip-icon bar, level icon + name + expiry badge for members,
  * vip_1 icon + "开通会员 尊享会员权益" otherwise, chevron pinned right.
- * Navigation keeps the Jio <a href data-tab> contract instead of the reference click proxy.
+ * Navigation uses the Jio <a href data-tab> contract.
  *
  * @package Jio
  */
@@ -27,7 +26,7 @@ $vip_url = jio_get_user_center_tab_url('vip');
 
 if ($vip_level > 0) {
 	$vip_name = (string) ($vip_levels[$vip_level]['name_html'] ?? $vip_levels[$vip_level]['name'] ?? ('VIP' . $vip_level));
-	// Same semantics as zib_get_user_vip_exp_date_text(): date / 会员已过期 / 永久会员,
+	// Expiry badge: date / 会员已过期 / 永久会员,
 	// and no badge at all when there is no expiry data.
 	$expires = max(0, (int) ($vip_state['expires'] ?? 0));
 	$exp_label = '';
@@ -41,11 +40,11 @@ if ($vip_level > 0) {
 		. '<span>' . wp_kses_post($vip_name) . '</span>';
 	if ($exp_label !== '') {
 		$button .= '<span class="ml10 badg jb-yellow vip-expdate-tag">'
-			. jio_icon_markup('zibsvg-time', 'mr3')
+			. jio_icon_markup('jiosvg-time', 'mr3')
 			. esc_html($exp_label) . '</span>';
 	}
 } else {
-	$button = jio_icon_markup('zibsvg-vip_1', 'em12 mr6') . esc_html__('开通会员 尊享会员权益', 'jio');
+	$button = jio_icon_markup('jiosvg-vip_1', 'em12 mr6') . esc_html__('开通会员 尊享会员权益', 'jio');
 }
 
 $vip_class = 'uc-sidebar-vip mb20 mb10-sm main-radius payvip-icon btn-block badg pointer' . ($user_id <= 0 ? ' signin-loader' : '');