feat(admin-ui): 订阅/套餐筛选区可折叠并记忆状态

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

@@ -133,9 +133,16 @@
     <div class="muted muted-xs mt-6">建议：先处理“7天内到期”续费触达，再处理“已过期”补单或关闭。</div>
 </div>
 
-<div class="card mb-20">
-    <h3>筛选条件</h3>
-    <form method="get" action="/admin/site-subscriptions" class="grid-4">
+<details class="card mb-20 collapsible" data-role="collapsible" data-storage-key="admin.site_subscriptions.filters" open>
+    <summary class="collapsible-summary">
+        <div class="flex-between items-center">
+            <h3 class="mb-0">筛选条件</h3>
+            <span class="muted muted-xs">点击收起/展开</span>
+        </div>
+    </summary>
+    <div class="collapsible-body">
+        <form method="get" action="/admin/site-subscriptions" class="grid-4">
+
         @if($safeBackForLinks !== '')
             <input type="hidden" name="back" value="{!! $safeBackForLinks !!}">
         @endif
@@ -166,8 +173,9 @@
         <div>
             <button class="btn btn-sm" type="submit">应用筛选</button>
         </div>
-    </form>
-</div>
+        </form>
+    </div>
+</details>
 
 <div class="grid-4 mb-20">
     <div class="card">