Add Dockerfile for Hugging Face Spaces deployment (port 7860)

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

Dockerfile

@@ -0,0 +1,21 @@
+FROM python:3.10-slim
+
+WORKDIR /app
+
+# Install dependencies first (layer cache)
+COPY requirements.txt pyproject.toml ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy source
+COPY src/   ./src/
+COPY config/ ./config/
+COPY web/    ./web/
+
+# Install the soci package (handles the src/ layout)
+RUN pip install --no-cache-dir -e .
+
+# Hugging Face Spaces requires port 7860
+ENV PORT=7860
+EXPOSE 7860
+
+CMD ["python", "-m", "uvicorn", "soci.api.server:app", "--host", "0.0.0.0", "--port", "7860"]