Changes

Caddy static assets: fonts 1y immutable, images/logos/icons 30d (was 1d for all)

PageSpeed flagged the 1-day TTL on every label (~110 KiB of woff2 re-fetched
daily per returning visitor). Font binaries never change in place, so they get
the same immutable policy as hashed build output; unhashed images/logos/icons
get 30 days + 1 day stale-while-revalidate. Stylesheets under /fonts/ stay on
the 30-day rule because they may be patched in place.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>