feat: 设置页面新增接口文档入口

xiaomusic/static/setting.html

@@ -166,6 +166,7 @@ var vConsole = new window.VConsole();
     <button id="get_music_list">获取歌单</button>
     <button class="save-button">保存</button>
     <a class="button" href="/downloadlog" download="xiaomusic.txt">下载日志文件</a>
+    <button onclick="location.href='/docs';">查看接口文档</button>
     <hr>
 
     <a href="/static/m3u.html" target="_blank">m3u文件转换工具</a>