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/credits-balance.php

@@ -64,7 +64,7 @@ $points_signin_label   = sprintf(__('签到领%s', 'jio'), $currency);
 </div>
 
 <?php if ($points_exchange_on) :
-	// 购买积分弹窗 — Zibll zibpay_get_points_pay_modal 1:1（商品盒 / 自定义 / 支付方式含卡密 / 立即支付）。
+	// 购买积分弹窗（商品盒 / 自定义 / 支付方式含卡密 / 立即支付）。
 	$pb_rate = max(1, (int) ($points_exchange['rate'] ?? 100));
 	$pb_min_points = max(1, (int) ($points_exchange['min_points'] ?? 100));
 	$pb_daily_max_points = max(1, (int) ($points_exchange['daily_max_points'] ?? 100000));
@@ -109,7 +109,7 @@ $points_signin_label   = sprintf(__('签到领%s', 'jio'), $currency);
 						<?php if ($points_packages) : ?>
 							<div class="muted-color mb6"><?php printf(esc_html__('请选择需购买的%s', 'jio'), esc_html($currency)); ?></div>
 							<?php foreach ($points_packages as $pidx => $ppkg) : ?>
-								<div class="zib-widget vip-product relative product-box<?php echo $pidx === 0 ? ' active' : ''; ?>" data-for="points_product" data-value="<?php echo esc_attr((string) $ppkg['key']); ?>">
+								<div class="jio-widget-box vip-product relative product-box<?php echo $pidx === 0 ? ' active' : ''; ?>" data-for="points_product" data-value="<?php echo esc_attr((string) $ppkg['key']); ?>">
 									<?php if (!empty($ppkg['tag'])) : ?>
 										<div class="abs-right vip-tag badg jb-yellow"><?php echo esc_html((string) $ppkg['tag']); ?></div>
 									<?php endif; ?>