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/Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Create models directory
+RUN mkdir -p models
+
+EXPOSE 8001
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8001"]