`_get_companion_stats` hardcoded `battery_mv: 0`, so every MeshCore companion
client connected to a Python repeater showed no battery, even when a sensor
plug-in was reporting one. The protocol side is already complete: the frame
server packs `battery_mv` into the STATS_TYPE_CORE frame and clients request it
via CMD_GET_BATT_AND_STORAGE.
Surface the first sensor reading that publishes a usable battery voltage,
accepting either `battery_voltage_mv` or `battery_voltage_v`. This covers an
attached UPS HAT as well as the battery of an openHop modem the repeater is
driving, which is the case that prompted this: a solar-powered modem whose
battery was invisible to the companion app right up until it went flat.
Returns 0 when no sensor reports a battery, which is what clients already
expect from a mains-powered node, and the lookup never raises — stats must
not be able to take down the companion connection.
skjegg
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