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/jio-header-userbox.php

@@ -9,7 +9,7 @@ defined('ABSPATH') || exit;
 
 if (!function_exists('jio_get_user_checkin_details_link')) :
 	/**
-	 * 已签到详情弹窗触发链接（参考主题 zib_get_user_checkin_details_link 1:1）：
+	 * 已签到详情弹窗触发链接：
 	 * 打开刷新式 mini 弹窗（高 240，移动端底部弹出，每次都重新拉取）。
 	 *
 	 * @param string $class 沿用入口按钮的类。
@@ -135,8 +135,8 @@ if (!function_exists('jio_header_user_wallet_mini')) :
 
 		$center = function_exists('jio_get_user_center_url') ? jio_get_user_center_url('credits') : '#';
 		$box    = '';
-		$balance_icon = jio_icon_markup('zibsvg-money-color-2', 'em14');
-		$points_icon  = jio_icon_markup('zibsvg-points-color', 'em14');
+		$balance_icon = jio_icon_markup('jiosvg-money-color-2', 'em14');
+		$points_icon  = jio_icon_markup('jiosvg-points-color', 'em14');
 
 		if ($balance_on) {
 			$box .= '<a rel="nofollow" style="flex: 1;" class="muted-box padding-6 flex1 radius4" href="' . esc_url($center) . '">'
@@ -199,9 +199,9 @@ if (!function_exists('jio_header_payvip_bar')) :
 		if ($level > 0) {
 			$levels = is_array($vip['levels'] ?? null) ? $vip['levels'] : [];
 			$name = (string) ($levels[$level]['name_html'] ?? $levels[$level]['name'] ?? ($level === 2 ? __('二级会员', 'jio') : __('一级会员', 'jio')));
-			// 到期徽章语义对齐参考主题 zib_get_user_vip_exp_date_text()：只有真的拿到
+			// 到期徽章语义：只有真的拿到
 			// 到期时间才渲染这枚徽章，已过期显示「会员已过期」否则显示裸日期；显式永久
-			// 会员显示「永久会员」；拿不到到期数据时参考主题返回 false，整枚徽章不渲染。
+			// 会员显示「永久会员」；拿不到到期数据时整枚徽章不渲染。
 			$exp_label = '';
 			if (function_exists('jio_get_user_vip_state')) {
 				$state   = jio_get_user_vip_state($user_id);
@@ -230,7 +230,7 @@ if (!function_exists('jio_header_payvip_bar')) :
 			return '';
 		}
 
-		// 1:1 对齐参考主题 zib_get_header_payvip_icon()：通栏、radius4、vip_1 SVG 图标、裸文案。
+		// 通栏、radius4、vip_1 SVG 图标、裸文案。
 		return '<div class="mt10 em09" style="padding:2px;">'
 			. '<a class="pay-vip but radius4 payvip-icon btn-block" href="javascript:;">'
 			. '<svg class="em12 mr6" aria-hidden="true"><use xlink:href="#icon-vip_1"></use></svg>'