When I run cards sync -p/i/b nothing happens
That's correct and normal. When you build your own lNuTyX, you are actually ahead of the status of any availables binaries for your NuTyX version. I did not yet start the construction of any binaries since I will move end of january /middle february to glib 2.21. More over, since the version sekong.5 is again available. It give me the chance to take the time I need to build a stable version of saravane.
To come back to your problem. They is actually no need at all to sync anything because your copy (the git version actually) is the most uptodate version. Now it's up to you to compile what you need.
If you really want to take the risk and use the existing binaries from saravane-14.11, Your /etc/cards.conf could look like this:
dir /root/saravane/desktop|http://downloads.nutyx.org/saravane/x86_64/desktop
dir /root/saravane/server|http://downloads.nutyx.org/saravane/x86_64/server
dir /root/saravane/system
logdir /var/log/pkgbuild
arch x86_64
locale fr
base /root/saravane/system
Adjust your arch and your language