fix(docker): keep runtime prune offline

Dockerfile

@@ -122,6 +122,7 @@ FROM build AS runtime-assets
 ARG OPENCLAW_EXTENSIONS
 ARG OPENCLAW_BUNDLED_PLUGIN_DIR
 RUN --mount=type=cache,id=openclaw-pnpm-store,target=/root/.local/share/pnpm/store,sharing=locked \
+    pnpm store add source-map@0.6.1 && \
     CI=true pnpm prune --prod \
       --config.offline=true \
       --config.supportedArchitectures.os=linux \