v1.6.21

Fixed

• Orphan "4" and Vapor Pressure Deficit entities persisted on gateway after v1.6.20: v1.6.20 routed common_list decimal IDs "3" (Feels Like) and "5" (VPD) to the outdoor weather station device and removed the spurious "4" sensor type that was never in the V1.0.6 spec. Entities created on the gateway device by earlier versions kept their old gateway-based unique_id and went "unavailable", because the new code creates entities under different unique_ids on the outdoor station. The integration now migrates "3" and "5" orphans to the active outdoor weather station (preserving history) and removes the orphan "4" entry on startup. Live-data processing also now skips unknown numeric sensor keys so a stray "4" from gateway firmware no longer re-creates an unnamed entity. (issue #178)