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Add dedicated dwg2dxf container (Debian slim + libredwg-tools + Flask) instead of modifying the Alpine base image. The ArchiTools API route proxies to the sidecar over Docker internal network. - dwg2dxf-api/: Dockerfile + Flask app (POST /convert, GET /health) - docker-compose.yml: dwg2dxf service, healthcheck, depends_on - route.ts: rewritten from local exec to HTTP proxy - .dockerignore: exclude sidecar from main build context Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>