Add formatting and type checks

tests/test_security.py

@@ -136,7 +136,7 @@ def test_dashboard_unlock_cookie_rejects_password_hash_signed_forgery(tmp_path:
 
 def test_settings_reject_unknown_constructor_fields() -> None:
     with pytest.raises(ValueError, match="Extra inputs are not permitted"):
-        DdnsSettings(admn_password="typo")
+        DdnsSettings(**{"admn_password": "typo"})
 
 
 def test_trusted_host_middleware_rejects_unlisted_host(tmp_path: Path) -> None: