Site subscriptions index: use BackUrl for orders count link

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

@@ -295,10 +295,13 @@
                     @php $cnt = (int) ($subscription->platform_orders_count ?? 0); @endphp
                     @if($cnt > 0)
                         @php
-                            $platformOrdersUrl = '/admin/platform-orders?' . \Illuminate\Support\Arr::query([
-                                'site_subscription_id' => $subscription->id,
-                                'back' => $back,
-                            ]);
+                            // 跳到平台订单页：附带 back 回到“订阅列表页自身（剔除 back）”，并统一走 BackUrl helper。
+                            $platformOrdersUrl = \App\Support\BackUrl::withBack(
+                                '/admin/platform-orders?' . \Illuminate\Support\Arr::query([
+                                    'site_subscription_id' => $subscription->id,
+                                ]),
+                                $back
+                            );
                         @endphp
                         <a href="{!! $platformOrdersUrl !!}">{{ $cnt }}</a>
                     @else