Previous limits (avg 120/min, burst 30) had no sourceCriterion. Traefik
default groups by request Host, so ALL users of rspace.online shared a
single 120/min bucket — tripped almost immediately under normal load
(repeated 429s in rpast, api/mi/models, etc).
Scope per Cloudflare client IP (CF-Connecting-IP header) and raise to
600/min average with 150 burst — interactive use can spike above 120/min
from one client easily (module loads + polling + autosave).
