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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.

This fixes an issue with RAG that stops loading documents as soon
as it reaches a file with unsupported mimetype.

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.