v1.11.1

Fixed

• The battery projection (_project_energy_kwh / _hours_until_depleted, used by both the switching decisions and the Akku-reicht display) was double-counting the household's deficit whenever available surplus was negative (base load alone exceeding solar -- common at dusk/night). available_surplus is now floored at 0 before subtracting, matching the pattern already used for managed_discharge_kw. Verified against a live scenario with 0 committed devices and negative surplus: projection went from ~7.8h to the correct ~16.3h.