v0.2.0 — EHS water heater & ERV fan

Units are now routed to the correct Home Assistant platform based on their DMS type:

• EHS / hydro units (e.g. "ACS") become a water_heater: on/off, supply mode (standard/power/force), tank target & current temperature, and away mode.
• Energy-recovery ventilators (pluserv, e.g. "Recuperatore") become a fan: on/off, speed (low/mid/high/turbo), and ventilation mode as a preset (auto/erv/normal/sleep).
• Indoor AC units remain climate entities.

Classification uses the tree-view metadata; anything unrecognised falls back to a climate entity so no unit is ever dropped.