feat(docker): complete Phase 4 - Dockerfiles and docker-compose orchestration with healthchecks

Dockerfile.worker

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONPATH=/app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app/ /app/app/
+
+EXPOSE 8001
+
+CMD ["python", "-m", "app.worker.consumer"]