Add Fam account portal and describe Onion cloud projects

apps.json

@@ -1,8 +1,9 @@
 [
+  {"name":"Fam 账号","description":"统一登录与账号管理，连接 Onion 和私人书房。","url":"https://auth.famzheng.me/","category":"工具","icon":"cube","access":"需登录"},
   {"name":"Music Lab","subtitle":"随身的音乐练习室","description":"找熟悉的旋律，收藏曲谱，用节拍器与鼓机陪你练习。","url":"https://music.famzheng.me/","category":"音乐","icon":"music","featured":true},
   {"name":"Hedgehog","subtitle":"一桌人，一起玩","description":"从扫码入座开始，让小骰子成为聚会里的伙伴。","url":"https://hh.famzheng.me/","category":"互动","icon":"dice","featured":true,"access":"内测"},
   {"name":"在场","subtitle":"把冷场交给骰子","description":"划一下换个性格，拍一拍聊两句。一个有声音的互动实验。","url":"https://dice.famzheng.me/","category":"互动","icon":"spark","featured":true,"access":"内测"},
-  {"name":"Onion","description":"中文图像编辑器，用图层、选区、文字和滤镜完成创作。请使用桌面版 Chrome。","url":"https://onion.famzheng.me/","category":"工具","icon":"spark"},
+  {"name":"Onion","description":"中文图像编辑器，登录 Fam 后自动保存项目、跨设备继续创作。请使用桌面版 Chrome。","url":"https://onion.famzheng.me/","category":"工具","icon":"spark"},
   {"name":"Read","description":"把文档带进浏览器，留一段专心阅读的时间。","url":"https://read.famzheng.me/","category":"工具","icon":"book","access":"私人"},
   {"name":"Track","description":"每日轨迹与日记，把走过的路留作自己的记录。","url":"https://track.famzheng.me/","category":"生活","icon":"route","access":"私人"},
   {"name":"Notes","description":"随手记下念头，整理值得留下的片段。","url":"https://notes.famzheng.me/","category":"工具","icon":"note"},