New endpoints (total now 65+):
- clear: clear debris/POI (bottom toolbar button)
- rotate: rotate building during placement
- copy_settings: copy building config to another building
- overlay: switch overlay view (power/temp/gas/liquid/automation/rooms/decor/light/germs/materials/suits/crops/radiation/priority)
- dupe_personal_priority: set per-duplicate task priority sliders
- battery_charge: set smart battery high/low charge limits
- valve_flow: set liquid/gas valve flow rate
- vent_pressure: set vent overpressure limit
- incubator_setting: set incubator egg priority
- fridge_temp: set refrigerator temperature
- GET /api/state/overlay: current overlay + available overlays list
CLI: clear, rotate, copy_settings, overlay, dupe_personal_priority,
battery_charge, valve_flow, vent_pressure, incubator_setting, fridge_temp
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