Frontend nginx ignores backend PORT configuration

[xyzuanli]

Description

When deploying Catalyst with Docker Compose, changing the backend service port through the PORT environment variable does not update the frontend nginx proxy configuration.

The backend container starts successfully and listens on the configured port, but the frontend nginx configuration still uses a hardcoded upstream port (3000), causing all API requests to fail with 502 Bad Gateway.

Environment

• Catalyst version: latest Docker image
• Deployment method: Docker Compose
• Frontend: nginx-based frontend container
• Backend: configured with custom PORT environment variable

Actual behavior

The backend correctly starts on the configured port.

However, the frontend nginx configuration still contains a hardcoded upstream:

proxy_pass http://<backend-host>:3000;

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