🧹 [Code Health] Remove unused sys import in ruview_live.py

[manupawickramasinghe]

🎯 What: Removed the unused import sys statement from examples/ruview_live.py.
💡 Why: This improves the maintainability and readability of the codebase by removing an unnecessary import, as identified by AST analysis.
✅ Verification: Ran syntax check with python3 -m py_compile examples/ruview_live.py and manually executed the script in test mode python3 examples/ruview_live.py --duration 5 --interval 1 --csi none --mmwave none to ensure there were no runtime import errors. Also ran the docker entrypoint test script ./tests/test_docker_entrypoint.sh.
✨ Result: Cleaner code without changing functionality.

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PR created automatically by Jules for task 3710983807279768611 started by @manupawickramasinghe

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