[andig]

fixes #35732

Some chargers (Huawei SCharger) report Energy.Active.Import.Register as 0 outside transactions. Since a lifetime register is never zero, zero readings are no longer stored. Before the first non-zero reading, total energy is unavailable and the charge rater takes its start value as soon as the first real reading arrives.

• prevents both negative session energy (stop reads 0) and the spike (start reads 0, e.g. first session after restart)
• applies to phase-specific energy registers, too
• a skipped zero reading still counts as a fresh meter update, so meter timeouts and watchdog triggers are unaffected

🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

No active review issues are recorded for the zero-energy filtering change.

No open issues 🎉

2 resolved since last review

• Update timestamps when suppressing zero-energy readings
• Apply zero-energy guard to phase-specific registers

_{Review effort: Balanced}