Upgrade pyannote community dependency stack

Reapply pyannote downgrade changes

Refactor pyannote token handling

Revert repository state to c7d2aa0

Revert repository state to e4b57c8

Replicate working ZeroGPU Parakeet reference space

Reset repo for phased rebuild and scaffold Phase 1 Parakeet API

fix(pyannote): support older auth arg name

feat(api): add pyannote-only diarize endpoint

feat(api): add parakeet-only transcribe endpoint