The package currently only has the binary in /usr/bin and some docs in /usr/share/docs(if I remember correctly)
No startup script, daemon or user/group (that i found).
Syncthing is intended to run as the user using it. Something could be rigged as mentioned in the other thread, although this might need tweaking for upstart/systemd/normal init and so on possibly.
For systemd there is a user unit in the repo which runs syncthing as the user issuing the command:
$ systemctl --user start syncthing.service
A user unit is also bound to an active user session. Syncthing is only started when you have logged in successfully. I have written about it in the wiki.
Alternatively, when you want to ensure syncthing running without an active user session, just use the templated system unit:
# systemctl start syncthing@myuser.service
That might be interesting for keeping syncthing running on a server or a raspberry pi. I have just added a few sentences about when to use which service to the wiki.