New $lib/redirects.server.ts: lazy-loads GET /api/redirects, exact-match
index with trailing-slash normalisation, 60s TTL with background refresh
(cold start blocks once, subsequent requests get stale cache instantly).
hooks.server.ts: before legacy-redirect fallback, runs lookupRedirect for
GET requests. Editor-defined rules win over hardcoded /blog→/posts etc.
External targets (http://…) drop query; internal targets keep ?search.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Peter Meier