Set Europe/Paris timezone in all nuc containers

Applied live to the 5 running containers; install scripts and the
post-install checklist now include the timedatectl step.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

nuc/transmission-bt.md

@@ -44,6 +44,7 @@ IMAGE="${IMAGE:-images:ubuntu/24.04}"
 incus launch "$IMAGE" "$CNAME"
 sleep 8
 incus config set "$CNAME" environment.DEBIAN_FRONTEND=noninteractive
+incus exec "$CNAME" -- timedatectl set-timezone Europe/Paris
 
 # static LAN config, NO default route (kill switch), /32 to the WG endpoint
 incus exec "$CNAME" -- bash -c 'cat > /etc/netplan/10-lxc.yaml <<EOF