How can I add a new user?

CoreELEC:~ # ls -al /opt/etc/passwd
lrwxrwxrwx  1 root root  11 Feb  8 09:01 /opt/etc/passwd -> /etc/passwd

Which means entware is using passwd file from CoreELEC where those files are readonly.

But you can try to remove symbolic links and copy files from CE. Maybe it will work (do it on your own risk).

rm /opt/etc/passwd /opt/etc/shadow /opt/etc/group
cp /etc/passwd /etc/shadow /etc/group /opt/etc
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