feat(admin): 履约完成或终态时自动隐藏暂停与关闭兑换按钮

- 任务详情页（AdminTaskDetailPage）：若任务已履约完成（completed/delivered/success）或订单已完成/已退款，自动隐藏【暂停兑换】和【关闭兑换】按钮，避免误操作
- 订单详情页（AdminOrderDetailPage）：若订单下任务已全部履约完成或订单终态，同样自动隐藏【暂停兑换】和【关闭兑换】
- 针对已被暂停/关闭的历史订单，始终保留【恢复启用】入口以便误操作时补救
- 验证方式：前端类型检查（0 error）、前端单测 132 项全通及前端 Vite 重新构建成功

apps/frontend/src/pages/admin/AdminOrderDetailPage.tsx

@@ -147,6 +147,18 @@ export default function AdminOrderDetailPage() {
     },
   ]
 
+  const allTasksCompleted =
+    detail.tasks.length > 0 &&
+    detail.tasks.every(
+      (t) =>
+        ['completed', 'redeemed', 'delivered', 'success'].includes(t.status) ||
+        t.deliveryStatus === 'delivered',
+    )
+  const isOrderFulfilled = detail.order.orderStatus === 'completed' || allTasksCompleted
+  const isOrderRefundedOrCancelled =
+    detail.order.payStatus === 'refunded' || detail.order.orderStatus === 'cancelled'
+  const canPauseOrClose = !isOrderFulfilled && !isOrderRefundedOrCancelled
+
   return (
     <section className="page-stack">
       <PageHeader
@@ -171,7 +183,7 @@ export default function AdminOrderDetailPage() {
               >
                 恢复启用
               </Button>
-            ) : (
+            ) : canPauseOrClose ? (
               <Button
                 danger
                 icon={<PauseCircleOutlined />}
@@ -180,8 +192,8 @@ export default function AdminOrderDetailPage() {
               >
                 暂停兑换
               </Button>
-            )}
-            {detail.order.claimStatus !== 'closed' ? (
+            ) : null}
+            {canPauseOrClose && detail.order.claimStatus !== 'closed' ? (
               <Button
                 danger
                 icon={<StopOutlined />}

apps/frontend/src/pages/admin/AdminTaskDetailPage.tsx

@@ -266,6 +266,14 @@ export default function AdminTaskDetailPage() {
     : ''
   const claimStatus = resolvedDetail.order?.claimStatus || 'active'
   const claimStatusReason = resolvedDetail.order?.claimStatusReason || ''
+  const isTaskFulfilled =
+    ['completed', 'redeemed', 'delivered', 'success'].includes(resolvedDetail.task.status) ||
+    resolvedDetail.task.deliveryStatus === 'delivered'
+  const isOrderRefundedOrCancelled =
+    resolvedDetail.order?.payStatus === 'refunded' ||
+    resolvedDetail.order?.orderStatus === 'cancelled'
+  const isOrderCompleted = resolvedDetail.order?.orderStatus === 'completed'
+  const canPauseOrClose = !isTaskFulfilled && !isOrderCompleted && !isOrderRefundedOrCancelled
 
   const handleCopyH5Link = () => {
     if (!h5ClaimUrl) return
@@ -452,7 +460,7 @@ export default function AdminTaskDetailPage() {
                       </Button>
                       {orderId ? (
                         <>
-                          {claimStatus !== 'paused' && (
+                          {canPauseOrClose && claimStatus !== 'paused' && (
                             <Button
                               danger
                               style={{ color: '#fa8c16', borderColor: '#ffa39e' }}
@@ -462,7 +470,7 @@ export default function AdminTaskDetailPage() {
                               暂停兑换
                             </Button>
                           )}
-                          {claimStatus !== 'closed' && (
+                          {canPauseOrClose && claimStatus !== 'closed' && (
                             <Button
                               danger
                               icon={<StopOutlined />}