v2.1.0

Features

• add --mqtt-keys name-only to publish MQTT JSON keys without appending |unit (default remains name-with-unit)
• MQTT writes on modpoll/<device>/set accept a map of references {"ref_a": val, "ref_b": val} in one message; unknown keys are skipped with a warning

BREAKING CHANGES

• renamed --daemon / -d to --no-output (suppresses poll result tables only; does not fork)
• MQTT write payload must be a reference map ({"ref": val}); ref/value object format removed