feat(clan-cli): support multiple keys for a user

pkgs/clan-cli/clan_cli/vars/keygen.py

@@ -5,7 +5,7 @@ import os
 from clan_cli.errors import ClanError
 from clan_cli.flake import Flake
 from clan_cli.secrets.key import generate_key
-from clan_cli.secrets.sops import KeyType, maybe_get_admin_public_key
+from clan_cli.secrets.sops import maybe_get_admin_public_key
 from clan_cli.secrets.users import add_user
 
 log = logging.getLogger(__name__)
@@ -24,8 +24,7 @@ def keygen(user: str | None, flake: Flake, force: bool) -> None:
     add_user(
         flake_dir=flake.path,
         name=user,
-        key=pub_key.pubkey,
-        key_type=KeyType.AGE,
+        keys=[pub_key],
         force=force,
     )