feat: add root Dockerfile for HF Spaces deployment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,20 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+COPY code_debug_env/server/requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+ENV PYTHONPATH=/app
+ENV PYTHONUNBUFFERED=1
+
+EXPOSE 7860
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+    CMD curl -f http://localhost:7860/health || exit 1
+
+CMD ["uvicorn", "code_debug_env.server.app:app", "--host", "0.0.0.0", "--port", "7860"]