Add Dockerfile for Hugging Face Spaces deployment

Dockerfile

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+FROM python:3.10
+
+# Set working directory
+WORKDIR /code
+
+# Copy requirements
+COPY ./backend/requirements.txt /code/requirements.txt
+
+# Install dependencies
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+# Create necessary directories
+RUN mkdir -p /code/databases/csv /code/databases/schema /code/sample_data
+
+# Copy the entire project
+COPY . /code/
+
+# Hugging Face Spaces run on port 7860 by default
+ENV PORT=7860
+
+# Run the FastAPI app with Uvicorn
+CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "7860"]