feat(admin): subscription show summary stats

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

@@ -75,6 +75,25 @@
     </div>
 </div>
 
+<div class="grid-4 mb-20">
+    <div class="card">
+        <h3>关联订单总数</h3>
+        <div class="num-md">{{ $summaryStats['total_orders'] ?? 0 }}</div>
+    </div>
+    <div class="card">
+        <h3>已同步</h3>
+        <div class="num-md">{{ $summaryStats['synced_orders'] ?? 0 }}</div>
+    </div>
+    <div class="card">
+        <h3>同步失败</h3>
+        <div class="num-md">{{ $summaryStats['failed_orders'] ?? 0 }}</div>
+    </div>
+    <div class="card">
+        <h3>可同步（已支付+已生效+未同步）</h3>
+        <div class="num-md">{{ $summaryStats['syncable_orders'] ?? 0 }}</div>
+    </div>
+</div>
+
 <div class="card">
     <h3>关联平台订单（{{ $platformOrders->total() }}）</h3>
     <table>