Save / persist

Persist runtime REST changes with /settings/save and check save status.

Runtime changes are held until they are saved. Trigger a manual save with:

PUT /settings/save (token required; no JSON body)

curl -X PUT "http://${IP}/rest-api/settings/save" \
  -H "token: f4005bf8507999192162d989d5a60823"

Check save / autosave state with GET /status/save.