Deepgram migrates Speech-to-Text playground to Python SDK v6

{"**Who**":"Deepgram","**What**":"Migrated Speech-to-Text playground to Python SDK v6","**How**":"Rewritten from scratch using FastAPI, async python-socketio, uvicorn, and deepgram-sdk==6.0.1","**Why**":"v6 SDK is fully generated from the API schema, requiring widespread code changes"}