feat: unify renderer + teacher endpoints onto vLLM 0.20 /inference/v1/generate #2408

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Final Result: Bugbot completed review and found 2 potential issues.

Request ID: serverGenReqId_eea428b8-b38a-4f7d-a892-b6f05e0c25e4

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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