Move libvirt qemu logs from /tmp to /var/log to prevent auto-deletion
Ubuntu 24.04 systemd-tmpfiles automatically clears /tmp after 30 days, which causes VM spawning to fail when the mount point disappears. Moving to /var/log ensures persistence.
Closes #648 (closed)
Signed-off-by: michal.gubricky michal.gubricky@dnation.cloud