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>

assets/js/credits.js

@@ -337,7 +337,7 @@
 				closeChargeModal();
 			}
 		});
-		// Zibll data-for/data-value 选中模型：余额档位（.vip-product.product-box）
+		// data-for/data-value 选中模型：余额档位（.vip-product.product-box）
 		// 选中变化不产生 change 事件（隐藏 input 由程序赋值），需显式重置幂等键。
 		var customInput = modal.querySelector('input[name="custom_price"]');
 		function selectProduct(value) {
@@ -621,7 +621,7 @@
 		});
 	}
 
-	// ===== 购买积分（Zibll points-pay modal 1:1：商品/自定义 + 余额/卡密支付） =====
+	// ===== 购买积分（points-pay modal：商品/自定义 + 余额/卡密支付） =====
 	function initPointsPay() {
 		var modal = document.querySelector('[data-jio-points-pay-modal]');
 		if (!modal || modal.dataset.jioPointsPayInitialized === '1') return;
@@ -665,7 +665,7 @@
 			if (e.key === 'Escape' && modal.classList.contains('in')) closePointsModal();
 		});
 
-		// Zibll data-for/data-value 选中模型：积分商品档位。
+		// data-for/data-value 选中模型：积分商品档位。
 		function selectProduct(value) {
 			modal.querySelectorAll('[data-for="points_product"]').forEach(function (el) {
 				el.classList.toggle('active', el.getAttribute('data-value') === value);