fix(docker): fix Docker image does not provide web services

[dragonish]

In the currently published Docker image, only the last api stage is used, and no web stage is used, resulting in the image not providing web services, and only one API port of 3000 is available.

This PR creates a production stage that runs both Nginx and Node API services and uses Supervisord to manage both processes. Also use /api/ reverse proxy to internal 3000 port, exposing only 8080 port for convenience.

The results run container (8080:8080) provides:

• Web Interface: http://localhost:8080
• API endpoint: http://localhost:8080/api/redact