refactor: add chat build step to Dockerfile

Author: liuruibin

installer/Dockerfile

@@ -4,6 +4,7 @@ COPY ui ui
 RUN cd ui && \
     npm install && \
     npm run build-only && \
+    npm run build-only-chat && \
     rm -rf ./node_modules
 FROM ghcr.io/1panel-dev/maxkb-base:python3.11-pg17.4 AS stage-build