Admin dashboard: add billing workbench entry and quick links

resources/views/admin/dashboard.blade.php

@@ -22,6 +22,28 @@
         </table>
     </div>
 </div>
+
+<div class="card mb-20">
+    <h3 class="mt-0">收费工作台</h3>
+    <div class="muted">聚焦收费闭环的日常治理入口：订单 → 订阅 → 套餐。</div>
+
+    <div class="actions mt-12">
+        <a class="btn" href="/admin/platform-orders">进入平台订单</a>
+        <a class="btn btn-secondary" href="/admin/site-subscriptions">进入订阅管理</a>
+        <a class="btn btn-secondary" href="/admin/plans">进入套餐管理</a>
+    </div>
+
+    <div class="mt-12">
+        <div class="muted">快捷筛选：</div>
+        <div class="actions mt-8">
+            <a class="btn btn-secondary btn-sm" href="/admin/platform-orders?payment_status=unpaid&status=pending">待支付</a>
+            <a class="btn btn-secondary btn-sm" href="/admin/platform-orders?payment_status=paid&status=pending">待生效</a>
+            <a class="btn btn-secondary btn-sm" href="/admin/platform-orders?syncable_only=1">可同步</a>
+            <a class="btn btn-secondary btn-sm" href="/admin/platform-orders?sync_status=failed">同步失败</a>
+        </div>
+    </div>
+</div>
+
 <div class="grid">
     <div class="card"><div class="muted">站点</div><div class="num">{{ $stats['merchants'] }}</div></div>
     <div class="card"><div class="muted">管理员</div><div class="num">{{ $stats['admins'] }}</div></div>