feat: +thin-client role + AZ-TC-01..03 pilot

Auf Basis des Grilling-Sessions mit 20 design decisions umgesetztes
v1-Skeleton der Thin-Client-Rolle plus 3 Pilot-Hosts.

Architektur:
- roles/thin-client/ als geschlossene Rolle (default.nix compose + 7
  Subdirectories: hardware, session, identity, network, peripherals,
  apps, monitoring, deployment)
- hosts/AZ-TC-NN/default.nix als ~20-Zeilen-Wrapper pro Fleet-Host
- flake.nix instanziiert AZ-TC-01..03 via Fleet-Helper
- secrets.nix mit per-host agenix-Secret-Stubs

Submodule:
- hardware: dell-optiplex-micro + generic-x86_64-uefi Fallback
- identity: AD (sssd/krb5/keytab via agenix), lokale Notfalluser
  (sascha.koenig + jannik.mueller ohne m3ta-home), sudo-Policy
- session: KDE Plasma 6 + Wayland + SDDM, Branding (Wallpaper + Footer),
  PipeWire Audio
- network: NetworkManager + wpa_supplicant + 802.1X EAP-TLS, NetBird
  + SSH via NetBird, systemd-resolved (Corp + NetBird DNS), hardened
  firewall, OpenSSH
- peripherals: CUPS mit Pull-Print-Queue, pam_mount für DFS-Shares
- apps: Chromium (ManagedBookmarks, Bitwarden force-install, no local
  passwords), Office-Web .desktop-Shortcuts, Remmina (mehrere TS,
  Kerberos SSO), RustDesk Client + Daemon, OBS Studio, Autostart
- monitoring: node_exporter → Pushgateway, Alloy (stub für Loki),
  Snipe-IT Asset-Checkin (stub)
- deployment: Disko BTRFS-Layout, auto-upgrade daily + reboot window,
  snapper snapshots

Build-Validierung: 'nix flake check' bestanden für AZ-TC-01/02/03.

Siehe roles/thin-client/README.md für den Provisionierungs-Workflow
und die Liste der noch auszufüllenden Platzhalter (TODO-Kommentare
in den jeweiligen Modulen).

roles/thin-client/peripherals/printing.nix

@@ -0,0 +1,54 @@
+# roles/thin-client/peripherals/printing.nix
+#
+# CUPS with the single Pull-Print queue. Q16 decision: All users print
+# to one queue, retrieve at any physical device via badge/PIN.
+#
+# Driverless IPPS — no vendor driver needed.
+{config, lib, pkgs, ...}: let
+  inherit (lib) mkIf mkOption types;
+  cfg = config.az.tc;
+in {
+  options.az.tc.printing = {
+    pullPrintEndpoint = mkOption {
+      type = types.str;
+      default = "ipps://pull-print.az-group.local:443/ipp/print"; # TODO: real endpoint
+      description = ''
+        IPPS URI of the Pull-Print queue. All thin clients print here.
+      '';
+    };
+
+    queueName = mkOption {
+      type = types.str;
+      default = "Pull-Print";
+      description = "Name of the local CUPS queue for the Pull-Print endpoint.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.printing = {
+      enable = true;
+      drivers = with pkgs; [cups-filters];
+      browsing = false;
+      listenAddresses = ["localhost:631"];
+      allowFrom = ["localhost"];
+    };
+
+    # No Avahi — Q16 decision: "Avahi aus".
+    services.avahi.enable = false;
+
+    # Single Pull-Print queue
+    hardware.printers = {
+      ensurePrinters = [
+        {
+          name = config.az.tc.printing.queueName;
+          location = "Pull-Print";
+          description = "Central Pull-Print queue (follow-me print)";
+          deviceUri = config.az.tc.printing.pullPrintEndpoint;
+          model = "everywhere";
+          ppdOptions = {PageSize = "A4";};
+        }
+      ];
+      ensureDefaultPrinter = config.az.tc.printing.queueName;
+    };
+  };
+}