Create Dockerfile

Add dockerfile for Hugging Face deployment through spaces

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY backend/requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ .
+
+# Expose the mandatory Hugging Face port
+EXPOSE 7860
+
+CMD [ "uvicorn", "server.api_server:app", "--host", "0.0.0.0", "--port", "7860" ]