feat(admin): site subscription show page with related platform orders

app/Http/Controllers/Admin/SiteSubscriptionController.php

@@ -9,11 +9,44 @@ use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Http\Request;
 use Illuminate\View\View;
 use Symfony\Component\HttpFoundation\StreamedResponse;
+use App\Models\PlatformOrder;
 
 class SiteSubscriptionController extends Controller
 {
     use ResolvesPlatformAdminContext;
 
+    public function show(Request $request, SiteSubscription $subscription): View
+    {
+        $this->ensurePlatformAdmin($request);
+
+        $subscription->loadMissing(['merchant', 'plan']);
+
+        $platformOrders = PlatformOrder::query()
+            ->where('site_subscription_id', $subscription->id)
+            ->latest('id')
+            ->paginate(10)
+            ->withQueryString();
+
+        $endsAt = $subscription->ends_at;
+        $expiryLabel = '无到期';
+        if ($endsAt) {
+            if ($endsAt->lt(now())) {
+                $expiryLabel = '已过期';
+            } elseif ($endsAt->lt(now()->addDays(7))) {
+                $expiryLabel = '7天内到期';
+            } else {
+                $expiryLabel = '未到期';
+            }
+        }
+
+        return view('admin.site_subscriptions.show', [
+            'subscription' => $subscription,
+            'platformOrders' => $platformOrders,
+            'statusLabels' => $this->statusLabels(),
+            'expiryLabel' => $expiryLabel,
+        ]);
+    }
+
     public function export(Request $request): StreamedResponse
     {
         $this->ensurePlatformAdmin($request);