fix(payment): parse money field in EasyPay webhook, cancel button text

- EasyPay VerifyNotification was not parsing the 'money' field, causing
  Amount=0 in PaymentNotification → amount mismatch error on callback
- Cancel button on QR page now shows "取消订单" instead of generic "取消"

backend/internal/payment/provider/easypay.go

@@ -12,6 +12,7 @@ import (
 	"net/http"
 	"net/url"
 	"sort"
+	"strconv"
 	"strings"
 	"time"
 
@@ -186,9 +187,10 @@ func (e *EasyPay) VerifyNotification(_ context.Context, rawBody string, _ map[st
 	if params["trade_status"] == "TRADE_SUCCESS" {
 		status = "success"
 	}
+	amount, _ := strconv.ParseFloat(params["money"], 64)
 	return &payment.PaymentNotification{
 		TradeNo: params["trade_no"], OrderID: params["out_trade_no"],
-		Status: status, RawData: rawBody,
+		Amount: amount, Status: status, RawData: rawBody,
 	}, nil
 }
 

frontend/src/i18n/locales/en.ts

@@ -5086,6 +5086,7 @@ export default {
       expiresIn: 'Expires in',
       expired: 'Order Expired',
       waitingPayment: 'Waiting for payment...',
+      cancelOrder: 'Cancel Order',
     },
     orders: {
       title: 'My Orders',

frontend/src/i18n/locales/zh.ts

@@ -5283,6 +5283,7 @@ export default {
       expiresIn: '剩余支付时间',
       expired: '订单已过期',
       waitingPayment: '等待支付...',
+      cancelOrder: '取消订单',
     },
     orders: {
       title: '我的订单',

frontend/src/views/user/PaymentQRCodeView.vue

@@ -16,7 +16,7 @@
       </div>
       <!-- Cancel button -->
       <button v-if="!expired && orderId" class="btn btn-secondary w-full" :disabled="cancelling" @click="handleCancel">
-        {{ cancelling ? t('common.processing') : t('common.cancel') }}
+        {{ cancelling ? t('common.processing') : t('payment.qr.cancelOrder') }}
       </button>
     </div>
   </AppLayout>