Move encryption algorithm ALGORITHM = "HS256" to config

[sameeramin]

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Example Code

N/A

Description

I've noticed that we have been defining the encryption algorithm variable more than once and there's no single source of truth. I propose to move it to config to solve this problem.

Operating System

macOS

Operating System Details

MacOS Sonomo

Python Version

3.10

Additional Context

No response

[YuriiMotov]

Currently ALGORITHM = "HS256" is defined only once in backend/app/core.security.py