feat(shipping): 前端添加48小时撤销限制

- 添加checkCanCancel函数判断是否在48小时内
- 超过48小时不显示撤销发货按钮
- 点击撤销时如超过48小时提示'需要撤销发货请联系客服'

pages/cabinet/index.vue

@@ -91,7 +91,7 @@
               <view class="shipment-status" :class="getStatusClass(item.status)">
                 {{ getStatusText(item.status) }}
               </view>
-              <text class="shipment-cancel" v-if="Number(item.status) === 1 && item.batch_no" @tap="onCancelShipping(item)">撤销发货</text>
+              <text class="shipment-cancel" v-if="Number(item.status) === 1 && item.batch_no && item.can_cancel" @tap="onCancelShipping(item)">撤销发货</text>
             </view>
           </view>
           
@@ -429,6 +429,9 @@ async function loadShipments(uid) {
         productNames = ['未知商品']
       }
 
+      // 判断是否可以撤销（48小时内且状态为待发货）
+      const canCancel = checkCanCancel(s.status, s.created_at)
+
       return {
         batch_no: s.batch_no || '',
         count: s.count ?? (Array.isArray(s.inventory_ids) ? s.inventory_ids.length : 0),
@@ -440,7 +443,8 @@ async function loadShipments(uid) {
         created_at: s.created_at || '',
         shipped_at: s.shipped_at || '',
         received_at: s.received_at || '',
-        status: s.status || 1
+        status: s.status || 1,
+        can_cancel: canCancel
       }
     })
     
@@ -692,10 +696,39 @@ async function onShip() {
   })
 }
 
+// 检查是否可以撤销发货（48小时内）
+function checkCanCancel(status, createdAt) {
+  // 只有待发货状态(status=1)才能撤销
+  if (Number(status) !== 1) {
+    return false
+  }
+  // 没有创建时间，默认允许撤销（兼容旧数据）
+  if (!createdAt) {
+    return true
+  }
+  const created = new Date(createdAt).getTime()
+  const now = Date.now()
+  const diffHours = (now - created) / (1000 * 60 * 60)
+  // 48小时内可以撤销
+  return diffHours <= 48
+}
+
 function onCancelShipping(shipment) {
   const user_id = uni.getStorageSync('user_id')
   const batchNo = shipment && shipment.batch_no
   if (!user_id || !batchNo) return
+
+  // 前端再次检查48小时限制
+  if (!checkCanCancel(shipment.status, shipment.created_at)) {
+    uni.showModal({
+      title: '提示',
+      content: '发货申请超过48小时，不允许撤销，需要撤销发货请联系客服',
+      showCancel: false,
+      confirmText: '知道了'
+    })
+    return
+  }
+
   uni.showModal({
     title: '撤销发货',
     content: `确认不再发货，并撤销发货单 ${batchNo} 吗？`,
@@ -711,7 +744,9 @@ function onCancelShipping(shipment) {
         shippedList.value = []
         await loadShipments(user_id)
       } catch (e) {
-        uni.showToast({ title: e?.message || '取消失败', icon: 'none' })
+        // 后端返回的错误信息可能包含"联系客服"提示
+        const msg = e?.message || '取消失败'
+        uni.showToast({ title: msg, icon: 'none' })
       } finally {
       }
     }