- Firmware: energy.c/h tracks relay ON-time and uptime via k_uptime_get,
load_watts (default 400W) persistent via Zephyr Settings API
- Payload extended from 7 to 15 bytes (backwards compatible):
relay ON-time (uint24), uptime (uint24), load in watts (uint16)
- New 'w' downlink for load configuration
- Fix downlink handler: 'i'/'w' commands now checked before combined packet
- Server: g2h_rs_energy_tracking table for lifetime power_consumption_wh,
reboot detection via uptime vs real elapsed time
- Decoder/encoder and docs updated
