feat(pay): 统一收银台四种模式（站内二维码/当前页跳转/表单提交/JSAPI）

- PaymentOrchestrator 统一返回 mode + code_url/payment_url/form_html/jsapi_params
- 支付宝：当面付二维码 / 电脑网站支付 / H5；微信：Native / H5 / JSAPI（WechatOpenid 静默授权）
- 易支付：PC mapi 二维码，移动端自动提交表单
- 删除旧键 alipay_payment_type / wechat_payment_type / epay_device 与 redirect/qr_content 字段
- 新增 pay-cashier.js，移除 window.open，订单状态接口改为 /pay/order/{n}
- 拆分 credits.js（affiliate / withdraw-history）至 1000 行以内

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/js/cms-download.js

@@ -281,7 +281,7 @@
 		const maxTries = 40;
 		const timer = setInterval(function () {
 			tries += 1;
-			fetch(REST_BASE + '/pay/content/order/' + encodeURIComponent(orderNumber), {
+			fetch(REST_BASE + '/pay/order/' + encodeURIComponent(orderNumber), {
 				method: 'GET',
 				credentials: 'same-origin',
 				headers: restHeaders(),
@@ -673,13 +673,17 @@
 				}
 				const data = (r.json && r.json.data) ? r.json.data : r.json;
 				delete button.dataset.aksrtOperationKey;
-				if (data && data.redirect && (data.payment_url || data.qr_content)) {
-					if (data.payment_url) {
-						window.open(data.payment_url, '_blank');
-					}
-					renderScanPay(data, returnFocusEl);
+				if (data && data.mode) {
 					if (window.AksrtModalRuntime) window.AksrtModalRuntime.invalidate(['orders']);
-					if (data.order_number) pollOrderPaid(data.order_number, returnFocusEl);
+					if (data.mode === 'qrcode') {
+						renderScanPay(data, returnFocusEl);
+					} else if (window.AksrtPayCashier) {
+						close();
+						window.AksrtPayCashier.handle(data, {});
+					}
+					if ((data.mode === 'qrcode' || data.mode === 'jsapi') && data.order_number) {
+						pollOrderPaid(data.order_number, returnFocusEl);
+					}
 					return;
 				}
 				window.location.reload();
@@ -693,12 +697,9 @@
 
 	function renderScanPay(data, returnFocusEl) {
 		data = data || {};
-		let body = '';
-		if (data.qr_content) {
-			body += '<div class="aksrt-dl-modal__code-card"><div class="aksrt-dl-modal__code-caption">凭证内容</div>' +
-				'<code class="aksrt-dl-modal__code aksrt-dl-modal__code--wrap">' + escapeHtml(String(data.qr_content)) + '</code></div>';
-		}
-		body += '<p class="aksrt-dl-modal__msg">' + escapeHtml(data.message || '请使用手机扫码完成支付，支付后刷新页面。') + '</p>';
+		const body = window.AksrtPayCashier
+			? window.AksrtPayCashier.qrHtml(data)
+			: '<p class="aksrt-dl-modal__msg">' + escapeHtml('收银台组件未加载，请刷新页面重试。') + '</p>';
 		open(
 			dlView('pay', {
 				subtitle: '支付完成后页面会自动刷新',