Answers 'is there a ParVagues web service running a dashboard?' — now yes.
Folds perf-tray's function into a web toolbar + extensible fleet hub.

- perf.py: rootless Thermals (hwmon) + detect_mode + sudo-backed set_mode,
  ported from perf-tray.py with Qt dropped (DRY-able with the tray later)
- server.py: stdlib http.server (Foundry lineage); GET/POST /api/perf, /api/hub.
  Binds 127.0.0.1 by default — mode-switch flips the CPU governor via sudo, so
  not LAN-triggerable unless --host 0.0.0.0
- ui/index.html: Ship's Bridge toolbar (live temp badge 55/70/85, mode switch,
  freq/fan/throttle) + hub cards (Foundry :8765, Armada :8731)
- bridge.py CLI (serve/status/perf); parvagues-bridge.service (systemd --user)
- 6 tests on pure perf logic; README incl. deploy + security notes

Smoke-tested: tests green, API live, mode detect + thermals reading correctly.