fix: adjust TOC to four-column layout with separate sub-items

decks/xinfra/slides.md

@@ -29,7 +29,7 @@ layout: default
 
 # 目录
 
-<div class="grid grid-cols-3 gap-8 mt-8">
+<div class="grid grid-cols-4 gap-8 mt-8">
 <div>
 
 ### 一、名词概述
@@ -47,10 +47,17 @@ layout: default
 - 监控告警链路
 - 安全认证流程
 
+</div>
+<div>
+
 ### 三、对接子系统
 
-- Wayne · CloudDM · CacheCloud
+- Wayne
-- Apollo · Grafana · qpass
+- CloudDM
+- CacheCloud
+- Apollo
+- Grafana
+- qpass
 
 </div>
 <div>