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/order-center.js

@@ -386,6 +386,23 @@
         return loadView(state);
     }
 
+	function pollOrder(state, number) {
+		var coordinator = window.AksrtVipPurchaseCoordinator;
+		if (!coordinator || typeof coordinator.poll !== "function") return null;
+		return coordinator.poll(number, {
+			tags: ["orders"],
+			onTerminal: function (result) {
+				if (window.AksrtPayCashier) window.AksrtPayCashier.close();
+				notyf(result.success ? "支付成功" : "支付未完成，请重试", result.success ? "success" : "danger");
+				invalidateOrder(number, null);
+				if (activeDetail(state, number)) openDetail(state, number);
+			},
+			onTimeout: function () {
+				notyf("支付状态暂未确认，请稍后刷新订单", "danger");
+			}
+		});
+	}
+
 	function startPayment(state, button) {
         var number = button.getAttribute("data-aksrt-order-pay") || "";
         var method = button.getAttribute("data-aksrt-order-method") || "";
@@ -397,8 +414,15 @@
 			delete state.operationKeys[actionKey];
             var data = result.data || {};
             invalidateOrder(number, data.order);
-            if (data.redirect && data.payment_url) {
-                window.location.assign(data.payment_url);
+            if (data.mode) {
+                button.disabled = false;
+                if (!window.AksrtPayCashier) return;
+                var handled = window.AksrtPayCashier.handle(data, {
+                    onClose: function () { if (poll) poll.abort(); }
+                });
+                var poll = handled === "qrcode" || handled === "jsapi"
+                    ? pollOrder(state, number)
+                    : null;
                 return;
             }
             notyf(data.message || "支付成功", "success");