simon 3cb0b5bbe9 Add LiPo battery monitoring with ESP-NOW cache and dashboard API.
Slaves report pack voltages every 30s; the master caches them for fast
BATTERY_STATUS reads. goTool exposes REST/WebSocket and shows values in
the dashboard, with a nanopb fix so optional lipo submessages encode.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-29 20:14:28 +02:00
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