platform_orders: add clear single sync_error action from show page

resources/views/admin/platform_orders/show.blade.php

@@ -565,7 +565,15 @@
 </div>
 
 <div class="card mb-20">
-    <h3>最近一次同步失败</h3>
+    <div class="flex-between">
+        <h3>最近一次同步失败</h3>
+        @if($activationError)
+            <form method="post" action="/admin/platform-orders/{{ $order->id }}/clear-sync-error" onsubmit="return confirm('确认清除该订单的同步失败标记？该操作仅清理 meta 标记，不会改变订阅/订单状态。');">
+                @csrf
+                <button class="btn btn-danger btn-sm" type="submit">清除失败标记</button>
+            </form>
+        @endif
+    </div>
     @if($activationError)
         <table>
             <tbody>
@@ -574,6 +582,7 @@
             <tr><th>操作管理员</th><td>{{ data_get($activationError, 'admin_id') ?: '-' }}</td></tr>
             </tbody>
         </table>
+        <div class="muted muted-xs mt-6">提示：当你已确认问题已解决，但历史失败标记仍残留时，可先清理标记，再点击上方「重试同步订阅」。</div>
     @else
         <p class="muted">暂无失败记录。</p>
     @endif