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/nuc-install.md

@@ -250,6 +250,9 @@ Both logs rotate monthly (`/etc/logrotate.d/incus-*`).
       `/etc/systemd/system/incus.service.d/after-zfs.conf` with
       `[Unit]` / `After=zfs-mount.service zfs.target`
 - [ ] `boot.autostart=true` on blocky, privoxy, jellyfin-*
+- [ ] Timezone `Europe/Paris` on host and in every container
+      (`incus exec <ct> -- timedatectl set-timezone Europe/Paris`;
+      the install scripts in the per-container docs include it)
 - [ ] Host boots to `multi-user.target`, nothing grabs the GPU
       (required by the jellyfin-client kiosk)
 - [ ] Jellyfin web at `http://192.168.0.5:8096`, kiosk UI on HDMI,