feat(admin): 订单详情进入订阅详情支持回跳(带 back)

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

@@ -126,7 +126,11 @@
             <tr>
                 <th>订阅管理</th>
                 <td>
-                    <a class="link" href="/admin/site-subscriptions/{{ $order->siteSubscription->id }}">打开订阅详情</a>
+                    @php
+                        $subBack = '/admin/platform-orders/' . $order->id;
+                        $openSubUrl = '/admin/site-subscriptions/' . $order->siteSubscription->id . '?' . \Illuminate\Support\Arr::query(['back' => $subBack]);
+                    @endphp
+                    <a class="link" href="{{ $openSubUrl }}">打开订阅详情</a>
                     <span class="muted">｜</span>
                     <a class="muted" href="/admin/site-subscriptions?merchant_id={{ $order->siteSubscription->merchant_id }}">同站点订阅</a>
                     <span class="muted">｜</span>

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

@@ -95,7 +95,7 @@
         @endphp
 
         @if($safeBack)
-            <a href="{{ $safeBack }}" class="muted">← 返回平台订单列表（保留筛选）</a>
+            <a href="{{ $safeBack }}" class="muted">← 返回上一页（保留上下文）</a>
             <span class="muted">｜</span>
         @endif