Source is copied before install because the root postinstall (nuxt prepare)
needs it, so the dependency layer can't be cached by ordering alone. A
BuildKit cache mount on pnpm's store keeps packages across builds instead.
- Add Nitro plugin to apply Drizzle migrations on server boot (skips when
DATABASE_URL is unset, e.g. during build).
- Split compose: docker-compose.dev.yml (hot-reload + Postgres) vs
docker-compose.yml (production/self-host, env-driven, Coolify-deployable).
- Add .dockerignore; parameterise compose env; document the autodeploy
decision (Coolify watches main, no CI workflow needed) in ADR 0003 and
plan.md T12.
