FRE-4473: Add VoicePrint job workers and Python ML service

- packages/jobs/: BullMQ-based async job queue for audio analysis
  with concurrency control and retry logic
- services/voiceprint-ml/: FastAPI microservice for ECAPA-TDNN
  inference with mock model, preprocessing, embedding extraction,
  and synthetic voice detection endpoints
- Includes Dockerfile and requirements.txt for ML service

Co-Authored-By: Paperclip <noreply@paperclip.ing>

services/voiceprint-ml/requirements.txt

@@ -0,0 +1,8 @@
+fastapi==0.104.1
+uvicorn==0.24.0
+pydantic==2.5.0
+numpy==1.26.0
+librosa==0.10.0
+torch==2.1.0
+faiss-cpu==1.7.4
+python-multipart==0.0.6