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from docker on mac get errors since num_ctx not recognized;
remove num_ctx from, and max_tokens to, body in API calls.

Endpoint role-checking was redundantly applied but FastAPI provides a nice abstraction mechanic...so I applied it. There should be no logical changes in this code; only simpler, cleaner ways for doing the same thing.

- 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