chore(libs): update uagents-ai-engine package to use new pyprojects.toml standard

[lrahmani]

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Proposed Changes

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Linked Issues

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Types of changes

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• [ ] Bug fix (non-breaking change that fixes an issue).
• [ ] New feature added (non-breaking change that adds functionality).
• [ ] Breaking change (fix or feature that would cause existing functionality to stop working as expected).
• [ ] Documentation update.
• [ ] Something else (e.g., tests, scripts, example, deployment, infrastructure).

Checklist

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• [ ] I have read the CONTRIBUTING guide
• [ ] Checks and tests pass locally

If applicable

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added/updated the documentation (executed the script in python/scripts/generate_api_docs.py)

Further comments

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