Add Dockerfile for Hugging Face deployment

Dockerfile

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+FROM python:3.9
+WORKDIR /code
+COPY ./requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+COPY . /code
+# Fix permissions for libraries that write to home
+RUN mkdir -p /tmp/home
+ENV HOME=/tmp/home
+# Start the FastAPI server on port 7860 (required by Hugging Face)
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]