feat: initial commit — VoiceCoach real-time voice coaching pipeline

Services: Pipecat agent (LiveKit + Claude + Whisper STT + Piper TTS),
SpeechBrain analysis service, Piper TTS service, web client (nginx).
Includes LiveKit server config and docker-compose orchestration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

speechbrain-service/requirements.txt

@@ -0,0 +1,12 @@
+fastapi==0.115.0
+uvicorn[standard]==0.30.0
+speechbrain==1.0.0
+huggingface_hub==0.19.4
+transformers==4.40.2
+torch==2.3.0
+torchaudio==2.3.0
+librosa==0.10.2
+soundfile==0.12.1
+numpy==1.26.4
+httpx==0.27.0
+python-multipart==0.0.9