Remove python-jose and replace with PyJWT

## Summary

The python-jose library has been dead for some time and should no longer be used. The [FastAPI docs recommend PyJWT](https://fastapi.tiangolo.com/tutorial/security/oauth2-jwt/#install-pyjwt)

Find where python-jose is imported and used in the codebase, likely in authentication or JWT handling modules. Replace those imports and usage with PyJWT, ensuring the API calls are compatible. Check the project's dependency file (e.g., pyproject.toml or requirements.txt) to update the library. Run existing tests to verify the replacement works correctly.

Written by the indexing model from the issue text.