chore: optimize python service Dockerfile (#319)

[OpadijoIdris]

Description

This PR optimizes the Python service Dockerfile to improve security, reduce image size, and ensure production readiness. It changes the base image to the more specific python:3.11-slim, removes development-only dependencies from the build process, and implements a container health check.

Closes #319

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Changes Made

• Updated the Dockerfile base image to python:3.11-slim for both builder and production stages.
• Removed development dependencies (pytest, pytest-asyncio, pytest-cov) from requirements.txt to ensure only production dependencies are installed.
• Added a HEALTHCHECK instruction to the Dockerfile to verify the /health endpoint using a built-in Python one-liner (avoiding the need to install curl).
• Verified that the service correctly runs as a non-root user (appuser) and uses Gunicorn as the production WSGI server.

Testing

Please describe the tests you ran and how to reproduce them:

• Unit tests pass
• Integration tests pass
• Manual testing completed (Verified Dockerfile syntax and requirements.txt modifications)

Test Coverage:

• N/A (DevOps / Infrastructure change)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests passed locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

N/A

Additional Notes

By using a Python one-liner for the health check (python -c "import urllib.request..."), we avoid having to install curl in

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