test PR- legacy prod

Summary by Bito

This PR implements significant refactoring of the UserController and AdminController, addressing critical null return values, correcting service naming conventions, and enhancing error handling. The changes include improved request mapping paths, a new updateuser endpoint, and documentation improvements to enhance code readability, correctness, and robustness.

Unit tests added: False

Estimated effort to review (1-5, lower is better): 3