平台订单列表：锁定订阅ID时显示上下文提示

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

@@ -30,6 +30,20 @@
             <a href="{{ $safeBack }}" class="muted">← 返回上一页（保留上下文）</a>
         </div>
     @endif
+
+    @php
+        $currentSubscription = $currentSubscription ?? null;
+    @endphp
+    @if($currentSubscription && $currentSubscription->id)
+        <div class="mt-10">
+            <div class="muted">当前已锁定订阅：</div>
+            <div>
+                <a class="link" href="/admin/site-subscriptions/{{ $currentSubscription->id }}">{{ $currentSubscription->subscription_no }}</a>
+                <span class="muted">（订阅ID：{{ $currentSubscription->id }}）</span>
+            </div>
+            <div class="muted muted-xs">提示：本页快捷筛选会保留该订阅ID；右上角“新建平台订单”会自动预填订阅ID。</div>
+        </div>
+    @endif
 </div>
 
 <div class="card mb-20">