Show back link on platform orders index when back param provided

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

@@ -12,6 +12,16 @@
 <div class="card mb-20">
     <p class="muted muted-tight">这里是总台视角的平台收费主链骨架页，当前阶段先承接套餐订购 / 续费 / 生效跟踪。</p>
     <p class="muted">本页先提供可访问列表、基础筛选与摘要卡，后续再补详情、导出、支付记录与退款轨迹。</p>
+
+    @php
+        $back = (string) request()->query('back', '');
+        $safeBack = str_starts_with($back, '/') ? $back : '';
+    @endphp
+    @if($safeBack)
+        <div class="mt-10">
+            <a href="{{ $safeBack }}" class="muted">← 返回上一页（保留上下文）</a>
+        </div>
+    @endif
 </div>
 
 <div class="card mb-20">