Add Dockerfile for Hugging Face deployment

Dockerfile

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+FROM python:3.10
+
+# Set the working directory to the root of the project
+WORKDIR /code
+
+# Copy requirements and install them globally
+COPY backend/requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+# Download NLTK data during the build step so it doesn't slow down startup
+RUN python -m nltk.downloader stopwords punkt punkt_tab wordnet
+
+# Copy the entire backend directory into the container
+COPY backend /code/backend
+
+# Set the working directory to backend so uvicorn can find api.py correctly
+WORKDIR /code/backend
+
+# Hugging Face Spaces requires the app to listen on port 7860
+EXPOSE 7860
+
+# Start the FastAPI app on port 7860
+CMD ["uvicorn", "api:app", "--host", "0.0.0.0", "--port", "7860"]