Add Docker Support (Dockerfile) and Deployment Documentation to Simplify Remote Access

[vcfgv]

Is your feature request related to a problem? Please describe.
Yes, some users are experiencing difficulties when deploying the project on a remote server.

Currently, the frontend service defaults to binding to localhost (127.0.0.1). When deployed on a Linux server, this makes port 1420 inaccessible from an external IP address.

According to #304, modifying frontend/package.json by changing the dev script to:
"dev": "react-router dev --host 0.0.0.0" may fix this but could be frustrating.

Describe the solution you'd like
I would like official Docker support added to the project. Specifically:

1. Add a Dockerfile (and docker-compose.yml): To provide a standardized, isolated environment for deployment.
2. Configurable Host Binding: The Docker setup should ensure the application listens on 0.0.0.0 inside the container so it is accessible externally. Ideally, this should be controlled via an environment variable (e.g., API_HOST=0.0.0.0 in .env) rather than hardcoding changes into package.json.
3. Documentation: A section in the README explaining how to build and run the image.

Additional context
As seen in the community discussions #304 #469, other users are facing the same issue with port 1420 access.