dev: add g++ install to dockerfile (required for uv build) (#60)

Author: enitrat

backend.dockerfile

@@ -16,6 +16,7 @@ COPY README.md ./python/
 RUN apt-get update && apt-get install -y --no-install-recommends \
     libpq-dev \
     gcc \
+    g++ \
     python3-dev \
     && rm -rf /var/lib/apt/lists/*