优化：已交付订单保留复制/打开发货链接，去掉作废操作

- 已交付订单仍可复用未过期链接查看兑换结果，但不再生成/续期新链接
- 商户后台已交付订单仅显示复制/打开，已作废/已过期单独标识
- 发货中/已取消订单不展示链接操作，避免无效按钮

frontend/src/pages/merchantCenterTabs.tsx

@@ -260,9 +260,29 @@ export function OrdersTab({
       key: 'delivery_link',
       width: 160,
       render: (_, record) => {
+        // 非可发货状态不再展示链接作废等操作；已交付订单保留复制/打开，便于查看兑换结果。
         if (record.order_status === 'cancelled') {
           return <Typography.Text type="secondary">订单已取消</Typography.Text>
         }
+        if (record.order_status === 'delivering') {
+          return <Typography.Text type="secondary">发货中</Typography.Text>
+        }
+        if (record.order_status === 'delivered') {
+          if (record.delivery_link_revoked_at) {
+            return <Tag color="red">已作废</Tag>
+          }
+          const expired = !record.delivery_link_expires_at
+            || new Date(record.delivery_link_expires_at).getTime() < Date.now()
+          if (expired) {
+            return <Typography.Text type="secondary">已过期</Typography.Text>
+          }
+          return (
+            <Space size={4} wrap>
+              <Button type="link" size="small" onClick={() => onCopyLink(record.order_no)}>复制</Button>
+              <Button type="link" size="small" onClick={() => onOpenLink(record.order_no)}>打开</Button>
+            </Space>
+          )
+        }
         if (record.delivery_link_revoked_at) {
           return <Button type="link" size="small" onClick={() => onRestoreLink(record.order_no)}>恢复链接</Button>
         }