Update cst.html

Author: Commandstone

cst.html

@@ -99,6 +99,7 @@
         <a href="https://cstx.zone.id/mv/mv.html" class="nav-item">💻视频</a>
         <a href="https://cstx.zone.id/game/game.html" class="nav-item">🎮小游戏</a>
         <a href="https://cstx.zone.id/funny/funny.html" class="nav-item">📦好玩的</a>
+        <a href="https://cstx.zone.id/cpgm/cpgm.html" class="nav-item">🛍️产品</a>
     </div>
 
     <div class="main-content">