Simplify admin nav: merge channel entry into system

resources/views/admin/settings/system.blade.php

@@ -8,6 +8,10 @@
     <p class="mt-0">系统配置已经从静态骨架切到数据库读取，当前已支持基础编辑、保存和缓存刷新。</p>
     <div class="muted">当前系统配置列表已接入缓存读取。</div>
     <div class="muted">当前配置分组数：{{ $groupedCount }}</div>
+
+    <div class="actions mt-12">
+        <a class="btn btn-secondary" href="/admin/settings/channels">渠道与支付配置</a>
+    </div>
 </div>
 
 @foreach($systemSettings->groupBy('group') as $group => $items)