fix: 去支付直接跳转收银台扫码支付，超时显示超时，失败显示错误信息

frontend/src/views/user/Checkout.vue

@@ -56,6 +56,12 @@
       </div>
     </div>
 
+    <div class="checkout-card loading" v-else-if="paymentError">
+      <el-icon :size="40" color="#f56c6c"><CircleCloseFilled /></el-icon>
+      <p class="error-text">{{ paymentError }}</p>
+      <el-button @click="$router.push('/orders')">返回订单</el-button>
+    </div>
+
     <div class="checkout-card loading" v-else>
       <el-icon class="is-loading" :size="32"><Loading /></el-icon>
       <p>正在创建支付订单...</p>
@@ -67,7 +73,7 @@
 import { ref, onMounted, onUnmounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { ElMessage } from 'element-plus'
-import { Loading } from '@element-plus/icons-vue'
+import { Loading, CircleCloseFilled } from '@element-plus/icons-vue'
 import { orderApi } from '../../api'
 import QRCode from 'qrcode'
 
@@ -75,6 +81,7 @@ const route = useRoute()
 const router = useRouter()
 const qrCanvas = ref<HTMLCanvasElement>()
 const paymentInfo = ref<any>(null)
+const paymentError = ref('')
 const remaining = ref(0)
 const totalTime = ref(0)
 let pollTimer: any = null
@@ -97,8 +104,7 @@ async function createPayment() {
     startCountdown()
     startPolling()
   } catch (err: any) {
-    ElMessage.error(err.response?.data?.error || '创建支付失败')
-    router.push('/orders')
+    paymentError.value = err.response?.data?.error || '创建支付失败'
   }
 }
 
@@ -325,5 +331,11 @@ onUnmounted(() => {
     color: rgba(255, 255, 255, 0.5);
     margin-top: 16px;
   }
+
+  .error-text {
+    color: #f56c6c;
+    font-size: 15px;
+    margin: 16px 0;
+  }
 }
 </style>

frontend/src/views/user/OrderDetail.vue

@@ -111,11 +111,7 @@ onMounted(async () => {
 })
 
 function goPay() {
-  if (order.value?.payment_method === 'bepusdt') {
-    router.push(`/checkout/${order.value.id}`)
-  } else {
-    ElMessage.info('请联系客服完成支付')
-  }
+  router.push(`/checkout/${order.value.id}`)
 }
 
 async function applyRefund() {

frontend/src/views/user/Orders.vue

@@ -70,11 +70,7 @@ async function fetchOrders() {
 }
 
 function goPay(row: any) {
-  if (row.payment_method === 'bepusdt') {
-    router.push(`/checkout/${row.id}`)
-  } else {
-    ElMessage.info('请联系客服完成支付')
-  }
+  router.push(`/checkout/${row.id}`)
 }
 
 async function cancelOrder(id: number) {