When sdrStep.PSUInW is available, prefer it over DCMI for
ramp.ServerLoadedW and ServerDeltaW. DCMI on this platform (MSI 4-PSU)
reports ~half actual draw; SDR sums all PSU_POWER_IN sensors correctly.
Delta is now SDR-to-SDR (sdrStep.PSUInW - sdrIdle.PSUInW) for
consistency. DCMI path kept as fallback when SDR has no PSU data.
Log message now indicates the source (SDR PSU AC input vs DCMI).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Michael Chus
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