feat(perf): pure parsing and arithmetic for the performance panel

/proc/stat deltas, meminfo, df rows, the fdinfo VRAM sum, byte rates,
hwmon lookup by chip name, the pubip cache in conky's format, and the
bands that colour the panel and the icon. A reading that cannot be
made is null, and null never raises the worst band, so a missing
sensor cannot raise an alarm. Only a fresh public IP can mismatch the
pinned one; a failed fetch goes stale instead.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

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