kanidm01: add kanidm authentication server

- New test-tier VM at 10.69.13.23 with role=auth
- Kanidm 1.8 server with HTTPS (443) and LDAPS (636)
- ACME certificate from internal CA (auth.home.2rjus.net)
- Provisioned groups: admins, users, ssh-users
- Provisioned user: torjus
- Daily backups at 22:00 (7 versions)
- Prometheus monitoring scrape target

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hosts/kanidm01/default.nix

@@ -0,0 +1,5 @@
+{ ... }: {
+  imports = [
+    ./configuration.nix
+  ];
+}