feat: 实现站内USDT收银台支付流程

- 后端: payment.go 支付处理(创建订单/回调通知/状态查询/签名算法)
- 后端: 新增公开支付通道API(PublicList,不暴露config)
- 前端: Checkout.vue 收银台页面(倒计时/二维码/支付轮询)
- 前端: Cart.vue 对接动态支付通道,选择bepusdt跳转收银台
- 前端: API添加paymentChannelApi和orderApi支付方法
- 路由: 注册checkout路由和支付相关API

frontend/src/views/user/Cart.vue

@@ -226,7 +226,7 @@ import {
   Wallet, Coin, ChatDotRound
 } from '@element-plus/icons-vue'
 import { useCartStore } from '../../store/cart'
-import { systemApi, addressApi, orderApi } from '../../api'
+import { systemApi, addressApi, orderApi, paymentChannelApi } from '../../api'
 import { getFirstImage } from '../../utils/image'
 import BackNav from '../../components/BackNav.vue'
 
@@ -252,21 +252,23 @@ const addressForm = reactive({
   is_default: false
 })
 
-const allPaymentMethods = [
-  { value: 'balance', label: '余额支付', icon: markRaw(Wallet) },
-  { value: 'alipay', label: '支付宝', icon: markRaw(Coin) },
-  { value: 'wechat', label: '微信支付', icon: markRaw(ChatDotRound) },
-]
+const typeIconMap: Record<string, any> = {
+  balance: markRaw(Wallet),
+  alipay: markRaw(Coin),
+  wechat: markRaw(ChatDotRound),
+  bepusdt: markRaw(Coin),
+  bank: markRaw(CreditCard),
+  other: markRaw(Coin),
+}
+
+const paymentChannels = ref<any[]>([])
 
 const availablePayments = computed(() => {
-  const enabledStr = settings.value.enabled_payments
-  if (!enabledStr) return [allPaymentMethods[0]]
-  try {
-    const enabled = JSON.parse(enabledStr)
-    return allPaymentMethods.filter(m => enabled.includes(m.value))
-  } catch {
-    return [allPaymentMethods[0]]
-  }
+  return paymentChannels.value.map(ch => ({
+    value: ch.code,
+    label: ch.name,
+    icon: typeIconMap[ch.type] || markRaw(Coin),
+  }))
 })
 
 const selectAll = computed({
@@ -321,8 +323,15 @@ async function fetchSettings() {
   try {
     const res: any = await systemApi.getPublicSettings()
     settings.value = res.data || {}
-    if (availablePayments.value.length > 0 && !selectedPayment.value) {
-      selectedPayment.value = availablePayments.value[0].value
+  } catch {}
+}
+
+async function fetchPaymentChannels() {
+  try {
+    const res: any = await paymentChannelApi.list()
+    paymentChannels.value = res.data || []
+    if (paymentChannels.value.length > 0 && !selectedPayment.value) {
+      selectedPayment.value = paymentChannels.value[0].code
     }
   } catch {}
 }
@@ -416,14 +425,20 @@ async function handleCheckout() {
   
   submitting.value = true
   try {
-    await orderApi.create({ 
+    const res: any = await orderApi.create({ 
       shipping_address_id: selectedAddressId.value,
       payment_method: selectedPayment.value,
       cart_item_ids: selectedIds.value
     })
     ElMessage.success('订单创建成功')
     await cartStore.fetchCart()
-    router.push('/orders')
+    const orderId = res.data?.id
+    const selectedChannel = paymentChannels.value.find(ch => ch.code === selectedPayment.value)
+    if (selectedChannel?.type === 'bepusdt' && orderId) {
+      router.push(`/checkout/${orderId}`)
+    } else {
+      router.push('/orders')
+    }
   } catch (err: any) {
     ElMessage.error(err.response?.data?.error || '订单创建失败')
   } finally {
@@ -441,6 +456,7 @@ onMounted(() => {
   cartStore.fetchCart()
   fetchSettings()
   fetchAddresses()
+  fetchPaymentChannels()
 })
 </script>
 

frontend/src/views/user/Checkout.vue

@@ -0,0 +1,329 @@
+<template>
+  <div class="checkout-page">
+    <div class="checkout-card" v-if="paymentInfo">
+      <div class="checkout-header">
+        <h2>USDT 支付</h2>
+        <span class="trade-type">{{ paymentInfo.trade_type?.toUpperCase() }}</span>
+      </div>
+
+      <div class="countdown" v-if="remaining > 0">
+        <svg viewBox="0 0 36 36" class="countdown-ring">
+          <circle cx="18" cy="18" r="16" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="2" />
+          <circle cx="18" cy="18" r="16" fill="none" stroke="#26a17b" stroke-width="2"
+            :stroke-dasharray="100.53" :stroke-dashoffset="100.53 * (1 - remaining / totalTime)"
+            stroke-linecap="round" transform="rotate(-90 18 18)" />
+        </svg>
+        <span>{{ Math.floor(remaining / 60) }}:{{ String(remaining % 60).padStart(2, '0') }}</span>
+      </div>
+      <div class="countdown expired" v-else>
+        <span>支付已超时</span>
+      </div>
+
+      <div class="amount-section">
+        <div class="amount-label">支付金额</div>
+        <div class="amount-value">{{ paymentInfo.actual_amount }} <small>USDT</small></div>
+        <div class="amount-cny">≈ ¥{{ paymentInfo.amount }}</div>
+      </div>
+
+      <div class="address-section">
+        <div class="address-label">收款地址</div>
+        <div class="address-box">
+          <span class="address-text">{{ paymentInfo.token }}</span>
+          <el-button type="primary" size="small" @click="copyAddress">复制</el-button>
+        </div>
+      </div>
+
+      <div class="qr-section">
+        <div class="qr-label">扫码支付</div>
+        <div class="qr-wrapper">
+          <canvas ref="qrCanvas"></canvas>
+        </div>
+      </div>
+
+      <div class="tips">
+        <p>1. 请使用 {{ paymentInfo.trade_type?.toUpperCase() }} 网络转账</p>
+        <p>2. 请准确转账 <strong>{{ paymentInfo.actual_amount }} USDT</strong></p>
+        <p>3. 转账后系统会自动确认，无需手动操作</p>
+      </div>
+
+      <div class="status-polling">
+        <el-icon class="is-loading"><Loading /></el-icon>
+        <span>等待支付确认中...</span>
+      </div>
+
+      <div class="actions">
+        <el-button @click="$router.push('/orders')">返回订单</el-button>
+      </div>
+    </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>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+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 { orderApi } from '../../api'
+import QRCode from 'qrcode'
+
+const route = useRoute()
+const router = useRouter()
+const qrCanvas = ref<HTMLCanvasElement>()
+const paymentInfo = ref<any>(null)
+const remaining = ref(0)
+const totalTime = ref(0)
+let pollTimer: any = null
+let countdownTimer: any = null
+
+async function createPayment() {
+  try {
+    const orderId = Number(route.params.id)
+    const res: any = await orderApi.createPayment(orderId)
+    paymentInfo.value = res.data
+    totalTime.value = res.data.expiration_time || 600
+    remaining.value = totalTime.value
+
+    await QRCode.toCanvas(qrCanvas.value, res.data.token, {
+      width: 180,
+      margin: 2,
+      color: { dark: '#000', light: '#fff' }
+    })
+
+    startCountdown()
+    startPolling()
+  } catch (err: any) {
+    ElMessage.error(err.response?.data?.error || '创建支付失败')
+    router.push('/orders')
+  }
+}
+
+function startCountdown() {
+  countdownTimer = setInterval(() => {
+    remaining.value--
+    if (remaining.value <= 0) {
+      clearInterval(countdownTimer)
+      clearInterval(pollTimer)
+    }
+  }, 1000)
+}
+
+function startPolling() {
+  const orderId = Number(route.params.id)
+  pollTimer = setInterval(async () => {
+    try {
+      const res: any = await orderApi.checkPaymentStatus(orderId)
+      if (res.data?.status === 'pending_confirm' || res.data?.status === 'completed') {
+        clearInterval(pollTimer)
+        clearInterval(countdownTimer)
+        ElMessage.success('支付成功！')
+        setTimeout(() => router.push(`/orders/${orderId}`), 1500)
+      }
+    } catch {}
+  }, 5000)
+}
+
+function copyAddress() {
+  if (paymentInfo.value?.token) {
+    navigator.clipboard.writeText(paymentInfo.value.token)
+    ElMessage.success('地址已复制')
+  }
+}
+
+onMounted(() => {
+  createPayment()
+})
+
+onUnmounted(() => {
+  clearInterval(pollTimer)
+  clearInterval(countdownTimer)
+})
+</script>
+
+<style scoped lang="scss">
+.checkout-page {
+  width: 100%;
+  min-height: 100%;
+  display: flex;
+  align-items: flex-start;
+  justify-content: center;
+  padding: 40px 16px;
+}
+
+.checkout-card {
+  background: #2d2d44;
+  border: 1px solid rgba(255, 255, 255, 0.06);
+  border-radius: 16px;
+  padding: 32px;
+  width: 100%;
+  max-width: 420px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.checkout-header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 24px;
+
+  h2 {
+    font-size: 20px;
+    font-weight: 600;
+    color: #fff;
+    margin: 0;
+  }
+
+  .trade-type {
+    background: rgba(38, 161, 123, 0.15);
+    color: #26a17b;
+    padding: 2px 10px;
+    border-radius: 12px;
+    font-size: 12px;
+    font-weight: 600;
+  }
+}
+
+.countdown {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 24px;
+  font-size: 18px;
+  font-weight: 600;
+  color: #26a17b;
+
+  .countdown-ring {
+    width: 24px;
+    height: 24px;
+  }
+
+  &.expired {
+    color: #f56c6c;
+  }
+}
+
+.amount-section {
+  text-align: center;
+  margin-bottom: 24px;
+
+  .amount-label {
+    font-size: 13px;
+    color: rgba(255, 255, 255, 0.5);
+    margin-bottom: 4px;
+  }
+
+  .amount-value {
+    font-size: 36px;
+    font-weight: 700;
+    color: #26a17b;
+
+    small {
+      font-size: 16px;
+      font-weight: 500;
+    }
+  }
+
+  .amount-cny {
+    font-size: 14px;
+    color: rgba(255, 255, 255, 0.5);
+    margin-top: 4px;
+  }
+}
+
+.address-section {
+  width: 100%;
+  margin-bottom: 24px;
+
+  .address-label {
+    font-size: 13px;
+    color: rgba(255, 255, 255, 0.5);
+    margin-bottom: 8px;
+  }
+
+  .address-box {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    background: rgba(255, 255, 255, 0.06);
+    border: 1px solid rgba(255, 255, 255, 0.08);
+    border-radius: 8px;
+    padding: 10px 12px;
+
+    .address-text {
+      flex: 1;
+      font-size: 13px;
+      color: #fff;
+      word-break: break-all;
+      font-family: monospace;
+    }
+  }
+}
+
+.qr-section {
+  margin-bottom: 24px;
+  text-align: center;
+
+  .qr-label {
+    font-size: 13px;
+    color: rgba(255, 255, 255, 0.5);
+    margin-bottom: 12px;
+  }
+
+  .qr-wrapper {
+    background: #fff;
+    border-radius: 12px;
+    padding: 12px;
+    display: inline-block;
+  }
+}
+
+.tips {
+  width: 100%;
+  background: rgba(255, 255, 255, 0.03);
+  border-radius: 8px;
+  padding: 12px 16px;
+  margin-bottom: 20px;
+
+  p {
+    font-size: 13px;
+    color: rgba(255, 255, 255, 0.6);
+    margin: 4px 0;
+    line-height: 1.6;
+
+    strong {
+      color: #26a17b;
+    }
+  }
+}
+
+.status-polling {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  color: rgba(255, 255, 255, 0.5);
+  font-size: 13px;
+  margin-bottom: 20px;
+}
+
+.actions {
+  width: 100%;
+  display: flex;
+  justify-content: center;
+}
+
+.loading {
+  min-height: 300px;
+  justify-content: center;
+
+  p {
+    color: rgba(255, 255, 255, 0.5);
+    margin-top: 16px;
+  }
+}
+</style>