Register a new user

curl --request POST \
  --url https://api.example.com/api/auth/register \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "jsmith@example.com",
  "password": "<string>",
  "name": "<string>",
  "invite_code": "<string>"
}
'

{
  "access_token": "<string>",
  "refresh_token": "<string>",
  "token_type": "bearer",
  "needs_onboarding": false,
  "mcp_credentials": {}
}