v0.3.0 — Swing control & EHS space heating

• Swing control on AC climate entities: off / vertical / horizontal / both. Each unit only advertises the vanes it actually has (vertical when the unit reports a UD vane, horizontal when useLRSwing is set).
• EHS space heating: the water-out (leaving-water) side of EHS units is now a second climate entity — heat/cool, leaving-water setpoint, per-mode limits — grouped under the same device as the existing hot-water water_heater.