Add Dockerfile at repo root for HF Spaces

Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Copy requirements from correct path within build context (repo root)
+COPY org_sim/server/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy full repo so org_sim package is importable
+COPY . .
+
+EXPOSE 8000
+
+# Module path from repo root
+CMD ["python", "-m", "uvicorn", "org_sim.server.app:app", "--host", "0.0.0.0", "--port", "8000"]