Added type hints into tests/unit/test_configuration_unknown_fields.py

Author: tisnik

tests/unit/test_configuration_unknown_fields.py

@@ -6,7 +6,7 @@
 from models.config import ServiceConfiguration
 
 
-def test_configuration_rejects_unknown_fields():
+def test_configuration_rejects_unknown_fields() -> None:
     """Test that configuration models reject unknown fields."""
     with pytest.raises(ValidationError, match="Extra inputs are not permitted"):
         ServiceConfiguration(host="localhost", port=8080, unknown_field="should_fail")