Add Docker image + docker-compose.yml

[BondarenkoCom]

Summary

A Dockerfile would let people run a node without installing Node.js locally. Essential for DePIN deployment (Akash, Render).

What to implement

• Dockerfile (Node 20 alpine, build + run)
• docker-compose.yml (node + optional Ollama sidecar)
• Document in README

Good first issue?

Yes — standard Node.js Docker setup. Bonus points for multi-stage build.

[Rhazieh]

Hi @BondarenkoCom! I see there are already basic Docker files in the repo, but I would like to tackle the 'bonus points' and refactor the Dockerfile into a Multi-stage build to reduce the final image size and improve security. Let me know if I can assign this to myself!