v0.41.0 — firmware-compat warning + get_config robustness

HA Add-on — pairs with Integration ≥ 0.18.0 and firmware ≥ v3.2.0-beta.8 (for gw_fw).

Added

• Gateway-firmware compatibility warning — the dashboard reads the gateway's gw_fw and warns when it's older than v3.0.0 (so the status grid isn't just blank with no explanation). Closes the firmware ⇄ add-on axis.

Fixed

• Charge Assistant get_config robustness — explicit return_response=1 so HA versions that read the flag by value don't 400 the bridge ("get_config HTTP 400: Bad Request").

Multi-gateway (from 0.40.0) + this compatibility work make the known-good set firmware v3.2.0-beta.9 · integration 0.18.1 · add-on 0.41.0.