feat: add host device type metadata

modules/secrets/sops.nix

@@ -8,15 +8,13 @@ in
 {
   flake.modules.nixos.sopsHost =
     {
+      hostType ? "desktop",
       lib,
-      host ? {
-        isServer = false;
-      },
       ...
     }:
     let
-      useHostSshKey = host.isServer;
-      useAdminKeyFile = !host.isServer;
+      useHostSshKey = hostType == "server";
+      useAdminKeyFile = hostType != "server";
       adminKeyDir = builtins.dirOf sopsAdminKeyPath;
     in
     {