Add Dockerfile for HF Spaces deployment

.dockerignore

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+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+venv/
+env/
+.venv
+.git
+.gitignore
+.env.local
+.env.*.local
+*.log
+.DS_Store
+node_modules/
+.next/
+dist/
+build/
+*.egg-info/
+.pytest_cache/
+.coverage
+htmlcov/
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.env
+.env.example
+README.md
+.dockerignore
+Dockerfile
+.github/

Dockerfile

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+# Read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
+# Based on HF Spaces best practices
+
+FROM python:3.12-slim-bullseye
+
+# Update system packages to patch vulnerabilities
+RUN apt-get update && apt-get upgrade -y && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user for security
+RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
+
+WORKDIR /app
+
+# Copy and install requirements
+COPY --chown=user ./requirements.txt requirements.txt
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+# Download NLTK data
+RUN python -m nltk.downloader stopwords wordnet punkt_tab
+
+# Install Playwright browsers
+RUN playwright install chromium
+
+# Copy application code
+COPY --chown=user . /app
+
+# Expose port (HF Spaces uses 7860)
+EXPOSE 7860
+
+# Run the application
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]