- Replace chooseAvatar button with chooseMedia (more reliable, works on all versions)
- COS avatar URL uses tx.vsai.net.cn instead of generated bucket domain
- Phone shows '已授权' only (no actual number displayed)
- Keep body as Buffer instead of utf8 string for multipart/form-data
- Set content-length header for multer compatibility
- Phone authorization shows '已授权' instead of actual number
- loadProfile() now returns Promise (was missing return)
- Avatar upload via COS instead of storing WeChat temp path
- Add POST /user/avatar endpoint with multer + COS SDK
- Incomplete registration detection: redirect to register if phone is empty
- New register page with chooseAvatar, nickname input (random default),
and required phone number authorization via getPhoneNumber
- Login simplified: removed deprecated wx.getUserProfile, checks
is_new_user flag to redirect new users to registration
- Server login response now includes is_new_user field
Guoguo