route-update.sh: after writing resolved, run mapcidr -a and -aa
in background to generate resolved.agg1 and resolved.agg2

route-web-api.py: read pre-aggregated files from cache instead of
calling mapcidr on each request. Instant response for aggregate=1|2.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>