chore(subscription): disable-on-submit for batch activate form

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

@@ -197,7 +197,7 @@
             </div>
         @endif
 
-        <form method="post" action="/admin/platform-orders/batch-activate-subscriptions" onsubmit="return confirm('确认批量同步该订阅下“可同步”的订单？（仅处理：已支付+已生效+未同步）');">
+        <form method="post" action="/admin/platform-orders/batch-activate-subscriptions" data-action="disable-on-submit" onsubmit="return confirm('确认批量同步该订阅下“可同步”的订单？（仅处理：已支付+已生效+未同步）');">
             @csrf
             <input type="hidden" name="scope" value="filtered">
             <input type="hidden" name="site_subscription_id" value="{{ $subscription->id }}">
@@ -208,6 +208,7 @@
                 <span>条（安全阀）</span>
             </label>
             <button class="btn btn-sm" type="submit">批量同步该订阅下可同步订单</button>
+            <div class="muted muted-xs mt-6">提示：点击后按钮会自动禁用，避免重复提交。</div>
         </form>
         <div class="muted muted-xs mt-6">说明：该按钮等价于平台订单页的“批量同步订阅（当前筛选范围）”，已内置只处理可同步订单（已支付+已生效+未同步）。</div>
     </div>