docs+feat: record backlog tip and move custom protocols to More

Document delivered IA and backlog four items; put custom plugins under
the wizard More group per design.

frontend/src/locales/zh-CN.json

@@ -365,7 +365,8 @@
     "installFailed": "{protocol} 安装失败",
     "groupEmployee": "员工接入",
     "groupSite": "站点对接",
-    "groupPenetrate": "内网穿透"
+    "groupPenetrate": "内网穿透",
+    "groupMore": "更多"
   },
   "users": {
     "title": "管理员",