feat(admin): subscription show failed reason top3

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

@@ -115,6 +115,20 @@
         <div class="num-md">{{ $summaryStats['unsynced_orders'] ?? 0 }}</div>
         <div class="muted muted-xs">无 activation 且无 error</div>
     </div>
+
+    <div class="card">
+        <h3>失败原因Top3</h3>
+        @php $failedReasonStats = $failedReasonStats ?? []; @endphp
+        @if(count($failedReasonStats) > 0)
+            <div class="muted mt-6">
+                @foreach($failedReasonStats as $item)
+                    <div>{{ $item['reason'] }} <span class="muted">（{{ $item['count'] }}）</span></div>
+                @endforeach
+            </div>
+        @else
+            <div class="muted">暂无失败原因聚合数据</div>
+        @endif
+    </div>
 </div>
 
 <div class="card">