Set port 3446 for web-evals in production mode

[cte]

Important

Set web-evals service to run on port 3446 in production mode, updating package.json, Dockerfile.web, and README.md.

• Behavior:
  • Set web-evals service to run on port 3446 in production mode by updating start script in package.json.
  • Update Dockerfile.web to expose port 3446 instead of 3000.
• Documentation:
  • Update README.md to reflect the new port 3446 for web service output and navigation instructions.

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[roomote]

Found one improvement for container accessibility.