Ok, looks like you should not have your srv mentioned anymore on /etc/config/storage file, if you don’t have have RAID in use. If you comment out srv part from yout /etc/config/storage file … then you can have your /srv enabled on /etc/config/fstab. And this will auto mount /srv correctly at start.
Feels like new version of NAS “extension” just can’t not be used any more if you don’t use RAID? And removing RAID support (mdadm) does not help. It still offers RAID options on reForis, and expects anything mentioned on storage file to be RAID?