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backend: make the data directory and the artifacts from the frontend customizable using environment variables
Signed-off-by: lucasew <lucas59356@gmail.com>

- feat: added new util to get the current user when needed. Middleware was adding authentication logic to all the routes. let's revisit if we can move the non-auth endpoints to a separate route.
- refac: update the routes to use new helpers for verification and retrieving user
- chore: added black for local formatting of py code

- refactored chat routes to use request.user instead of doing authentication in every route