feat: add Hugging Face Spaces deployment

- Add Spaces entry point (app.py)
- Add standalone requirements.txt
- Add Dockerfile for Spaces deployment
- Enable full-stack deployment on HF

Dockerfile.spaces

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install dependencies
+COPY pyproject.toml ./
+RUN pip install poetry && poetry config virtualenvs.create false && poetry install --no-dev
+
+# Copy application
+COPY src/ ./src/
+COPY app.py ./
+
+# Expose ports
+EXPOSE 7860 8000
+
+# Start both API and UI
+CMD uvicorn cascade.api.main:app --host 0.0.0.0 --port 8000 & \
+    streamlit run app.py --server.port 7860 --server.address 0.0.0.0

app.py

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+"""Hugging Face Spaces entry point for Cascade UI."""
+
+import sys
+import os
+
+# Add src to path
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'src'))
+
+# Import and run the main app
+from cascade.ui.app import main
+
+if __name__ == "__main__":
+    main()

requirements.txt

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+streamlit==1.31.0
+httpx==0.26.0
+plotly==5.18.0
+pandas==2.1.4
+pydantic==2.5.3
+pydantic-settings==2.1.0