chore: update licensing agreement to AGPL v3

[Prajna1999]

Summary

Target issue is #1171

• Change the licensing agreement to AGPL v3 from GPL v3 for this repo.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

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