Add Dockerfile and requirements

Dockerfile

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+FROM python:3.12-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . .
+EXPOSE 7860
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]

requirements.txt

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+fastapi>=0.115,<1
+uvicorn>=0.32,<1
+httpx>=0.27,<1