Wire the 1-minute CPU load average into the stats history pipeline:
- Rename HistorySample::reserved to load_avg1_pct (uint8_t, 0-100);
struct size unchanged.
- Populate load_avg1_pct in updateStatsHistory on ESP32 from
_cpu_tracker.getLoadAvg1() * 100.
- Register "cpu_load" series in buildPointValue / seriesTitle /
seriesUnit so buildSeriesJson serves it via
/api/stats?series=cpu_load.
- Persist load_avg1_pct as a 29th CSV column in flushSummaryLog.
parseSummaryLine accepts both 28-column (old, load_avg1_pct=0)
and 29-column (new) formats for backward compatibility.
- Add "cpu_load" to the web panel trend card order with orange
sparkline color (#e07b39), "N %" hover formatting, and a Y-axis
floored at 0 with a 10% minimum ceiling.
Valentin V. Bartenev
eaf3c4c263