Adds the two databases as infra services (own volume, ai-stack network, host-published UI ports like comfyui) for an upcoming RAG pipeline. Extraction/chunking/orchestration code is out of scope for this repo — it's app logic that calls into these DBs and llama-server, not compose infra. Neo4j password follows the omniroute secret pattern: blank in .env.example, auto-generated by scripts/update.sh. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DjhxWirQepKFEQj1huXNJR