feat: add generative proxy with usage metrics

Dockerfile

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+FROM python:3.12-slim
+ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1
+WORKDIR /app
+COPY pyproject.toml ./
+COPY app ./app
+RUN pip install --no-cache-dir .
+RUN useradd --create-home --uid 10001 appuser && mkdir -p /data && chown appuser:appuser /data
+USER appuser
+EXPOSE 8000
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1", "--timeout-keep-alive", "300"]