[Feature request] Api for apps to get temperature, free disk space, memory usage, etc.

[woofbotapp]

See: getumbrel/umbrel#1468

The api is already implemented - the only change needed is to refactor the auth.jwt part in lines like:

umbrel-manager/routes/v1/system.js

Line 136 in fc82349

router.get('/temperature', auth.jwt, safeHandler(async (req, res) => {