feat: power management for nas

hosts/nas/configuration.nix

@@ -21,6 +21,7 @@ in
     ./modules/audiobookshelf.nix
     ./modules/power-management.nix
     ./modules/disk-monitoring.nix
+    ./modules/auto-shutdown.nix
     ./modules/ugreen-leds.nix
 
     ./hardware-configuration.nix
@@ -45,6 +46,10 @@ in
   networking.firewall.enable = true;
   networking.firewall.allowedTCPPorts = [ 22 ];
 
+  # Wake-on-LAN: fw re-wakes the NAS on demand after auto-shutdown.
+  # Assumes WOL is enabled in BIOS; translates to `ethtool -s enp2s0 wol g`.
+  networking.interfaces.enp2s0.wakeOnLan.enable = true;
+
   # SOPS configuration
   sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
   sops.defaultSopsFile = ./secrets.yaml;