traefik: Rate-limit requests per client IP.

Attach a rateLimit middleware (10 r/s average, burst 100, per IPv4
address or IPv6 /64) to the web and websecure entrypoints, so it covers
every route.  Traefik keeps a separate bucket per router.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: I34d73eee3dd7746d202c2226c19d912d5a48c297
2 files changed