Initial infra scaffold: watcher live on Infomaniak Public Cloud

- flake.nix exposes a devShell (openstackclient, opentofu, sops, age) plus
  nixosConfigurations.watcher (runtime) and packages.watcher-image (QCOW2
  via nixos-generators / openstack format).
- hosts/watcher/default.nix: SSH-only base, tyro user with key auth, root
  SSH disabled, trusted-users set so laptop closure pushes work.
- modules/website.nix: Caddy serves tyrolize.ch from sites/tyrolize.ch/;
  lize.ch 301-redirects; firewall opens 80/443. Let's Encrypt via HTTP-01.
- terraform/infomaniak/: OpenStack provider, security group (22/80/443),
  keypair, compute instance booted from the uploaded image. Auth via OS_*
  env vars sourced from terraform/infomaniak/.env by the devShell hook.
- scripts/build-image.sh + scripts/deploy.sh.
- dns/{tyrolize,lize}.ch.zone: full BIND zone files for the advanced view
  in Infomaniak DNS Manager; preserves kSuite mail records on lize.ch.

Watcher live at 195.15.203.200 (IPv6 2001:1600:10💯:b4e), NixOS 25.05.
HTTPS confirmed working on both domains.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

terraform/infomaniak/outputs.tf

@@ -0,0 +1,14 @@
+output "watcher_ipv4" {
+  value       = openstack_compute_instance_v2.watcher.access_ip_v4
+  description = "Public IPv4 of the watcher VM"
+}
+
+output "watcher_ipv6" {
+  value       = openstack_compute_instance_v2.watcher.access_ip_v6
+  description = "Public IPv6 of the watcher VM"
+}
+
+output "watcher_id" {
+  value       = openstack_compute_instance_v2.watcher.id
+  description = "OpenStack instance ID (handy for `openstack server show`)"
+}