Session transcripts

Backend (Express):

POST /api/sessions/{id}/transcripts
GET  /api/sessions/{id}/transcripts/{transcript_id}
GET  /api/sessions/{id}/transcripts/{transcript_id}/status

AI Services real-time transcription:

POST /api/clinical/start
POST /api/clinical/chunk
POST /api/clinical/stop
POST /api/clinical/transcribe-full
GET  /api/clinical/session/{session_id}