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/configuration.nix

@@ -0,0 +1,77 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [
+    ../template2/hardware-configuration.nix
+
+    ../../system
+    ../../common/vm
+    ../../services/kanidm
+  ];
+
+  # Host metadata
+  homelab.host = {
+    tier = "test";
+    role = "auth";
+  };
+
+  # DNS CNAME for auth.home.2rjus.net
+  homelab.dns.cnames = [ "auth" ];
+
+  # Enable Vault integration
+  vault.enable = true;
+
+  # Enable remote deployment via NATS
+  homelab.deploy.enable = true;
+
+  nixpkgs.config.allowUnfree = true;
+  boot.loader.grub.enable = true;
+  boot.loader.grub.device = "/dev/vda";
+
+  networking.hostName = "kanidm01";
+  networking.domain = "home.2rjus.net";
+  networking.useNetworkd = true;
+  networking.useDHCP = false;
+  services.resolved.enable = true;
+  networking.nameservers = [
+    "10.69.13.5"
+    "10.69.13.6"
+  ];
+
+  systemd.network.enable = true;
+  systemd.network.networks."ens18" = {
+    matchConfig.Name = "ens18";
+    address = [
+      "10.69.13.23/24"
+    ];
+    routes = [
+      { Gateway = "10.69.13.1"; }
+    ];
+    linkConfig.RequiredForOnline = "routable";
+  };
+  time.timeZone = "Europe/Oslo";
+
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+  nix.settings.tarball-ttl = 0;
+  environment.systemPackages = with pkgs; [
+    vim
+    wget
+    git
+  ];
+
+  # Open ports in the firewall.
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  networking.firewall.enable = false;
+
+  system.stateVersion = "25.11"; # Did you read the comment?
+}