🧹 Remove unused sys import in vitals_suite.py

[manupawickramasinghe]

🎯 What: Removed an unused sys import from examples/medical/vitals_suite.py.
💡 Why: The import is unused and removing it improves code maintainability and readability.
✅ Verification: Ran syntax checks (python -m py_compile) and the project's docker entrypoint test suite.
✨ Result: A cleaner file without unnecessary imports.

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PR created automatically by Jules for task 16114068048620998190 started by @manupawickramasinghe

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