T9/Phase 7: deploy 4-container compose + Caddy reverse proxy

- docker-compose.yml: 4 services (db, api, spa, worker), Next.js removed
- Dockerfile.api: Bun base, install, run
- Dockerfile.worker: Bun base, install, run
- Dockerfile.spa: multi-stage (Bun build -> Caddy serve), fixed lockfile + workspace stubs
- Caddyfile: serve SPA + reverse-proxy /api/* + /mcp, SPA fallback routing
- Old Node worker stopped, replaced with new Bun worker
- Old Next.js server on :3000 stopped
- BASELINE.md: Phase 7 Deploy section added
- DEPLOY.md: deploy/rollback/debug guide added

docker-compose.yml

@@ -10,7 +10,6 @@ services:
       - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}
     volumes:
       - project-e-pg-data:/var/lib/postgresql/data
-      - ./drizzle/0000_first_mauler.sql:/docker-entrypoint-initdb.d/0000_first_mauler.sql:ro
     networks:
       - project-e-network
     healthcheck: