fix(subscription): return chat paywalls after payment

src/app/subscription/components/subscription-checkout-button.tsx

@@ -24,11 +24,13 @@ export interface SubscriptionCheckoutButtonProps {
   /** 是否可用（未选套餐 / 未勾选协议 → false） */
   disabled?: boolean;
   subscriptionType: "vip" | "voice";
+  returnTo?: "chat" | null;
 }
 
 export function SubscriptionCheckoutButton({
   disabled = false,
   subscriptionType,
+  returnTo = null,
 }: SubscriptionCheckoutButtonProps) {
   const payment = usePaymentState();
   const paymentDispatch = usePaymentDispatch();
@@ -67,6 +69,7 @@ export function SubscriptionCheckoutButton({
           orderId: payment.currentOrderId,
           paymentUrl,
           subscriptionType,
+          returnTo,
           onFailed: (errorMessage) =>
             paymentDispatch({ type: "PaymentLaunchFailed", errorMessage }),
         });
@@ -87,6 +90,7 @@ export function SubscriptionCheckoutButton({
     payment.launchNonce,
     payment.payParams,
     paymentDispatch,
+    returnTo,
     subscriptionType,
   ]);
 
@@ -150,6 +154,7 @@ export function SubscriptionCheckoutButton({
       orderId: payment.currentOrderId,
       paymentUrl: ezpayPaymentUrl,
       subscriptionType,
+      returnTo,
       onFailed: (errorMessage) => {
         setIsConfirmingEzpay(false);
         paymentDispatch({ type: "PaymentLaunchFailed", errorMessage });
@@ -241,6 +246,7 @@ interface RedirectToEzpayInput {
   orderId: string | null;
   paymentUrl: string;
   subscriptionType: "vip" | "voice";
+  returnTo?: "chat" | null;
   onFailed: (errorMessage: string) => void;
 }
 
@@ -248,6 +254,7 @@ async function launchEzpayRedirect({
   orderId,
   paymentUrl,
   subscriptionType,
+  returnTo,
   onFailed,
 }: RedirectToEzpayInput): Promise<void> {
   log.debug("[subscription-checkout] launchEzpayRedirect START", {
@@ -272,6 +279,7 @@ async function launchEzpayRedirect({
     orderId,
     payChannel: "ezpay",
     subscriptionType,
+    ...(returnTo ? { returnTo } : {}),
     createdAt: Date.now(),
   });
   if (Result.isErr(saveResult)) {