Add Dockerfile.

Dockerfile

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+FROM python:3.13-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /code
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY code/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY code/ .
+
+EXPOSE 8813
+
+CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", "--bind", "0.0.0.0:8813", "wsgi:app"]