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-wallet.php

@@ -100,7 +100,7 @@ $mark = (string) ($charge_view['currency_mark'] ?? '元');
 	<?php endif; ?>
 </div>
 
-<!-- Charge modal — Zibll balance-charge modal 1:1 (refresh_modal shell + zibpay_get_balance_charge_modal) -->
+<!-- Charge modal — balance-charge modal (refresh_modal shell) -->
 <?php
 $charge_method_logos = [
 	'balance'     => 'pay-balance-logo.svg',
@@ -124,7 +124,7 @@ $charge_mark_html = $charge_mark_symbol
 	? '<span class="px12">' . esc_html($mark) . '</span>'
 	: '';
 $charge_unit = $charge_mark_symbol ? '' : (string) $mark;
-// 与 Zibll 格式对齐（mark 前缀：最低充值￥1）；mark 配置为单位（元）时用后缀：最低充值1元。
+// 充值额度文案（mark 前缀：最低充值￥1）；mark 配置为单位（元）时用后缀：最低充值1元。
 $charge_limit_html = $charge_mark_symbol
 	? sprintf(__('最低充值%1$s1，最高充值%1$s%2$s', 'jio'), $mark, $custom_limit)
 	: sprintf(__('最低充值1%1$s，最高充值%2$s%1$s', 'jio'), $charge_unit, $custom_limit);
@@ -156,7 +156,7 @@ $charge_custom_block = static function () use ($mark, $charge_mark_html, $charge
 									$package_pay = $normalize_balance($pkg['pay_price'] ?? '');
 									$package_saving_minor = max(0, $package_credit->minor() - $package_pay->minor());
 									?>
-									<div class="zib-widget vip-product relative product-box<?php echo $idx === 0 ? ' active' : ''; ?>" data-for="balance_product" data-value="<?php echo esc_attr((string) $pkg['key']); ?>">
+									<div class="jio-widget-box vip-product relative product-box<?php echo $idx === 0 ? ' active' : ''; ?>" data-for="balance_product" data-value="<?php echo esc_attr((string) $pkg['key']); ?>">
 										<?php if (!empty($pkg['tag'])) : ?>
 											<div class="abs-right vip-tag badg jb-yellow"><?php echo esc_html((string) $pkg['tag']); ?></div>
 										<?php endif; ?>