Add Dockerfile for Hugging Face Spaces deployment

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /code
+
+COPY ./requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+COPY . /code/
+
+EXPOSE 7860
+
+CMD ["uvicorn", "api_main:app", "--host", "0.0.0.0", "--port", "7860"]