Revert "build: try to speed up web-build."

This reverts commit 245babb.

Author: liqiang-fit2cloud

installer/Dockerfile

@@ -1,10 +1,9 @@
 FROM node:24-alpine AS web-build
 COPY ui ui
 RUN cd ui && \
-    corepack enable && \
-    pnpm install && \
-    NODE_OPTIONS="--max-old-space-size=4096" pnpm run build && \
-    NODE_OPTIONS="--max-old-space-size=4096" pnpm run build-chat && \
+    npm install && \
+    NODE_OPTIONS="--max-old-space-size=4096" npm run build && \
+    NODE_OPTIONS="--max-old-space-size=4096" npm run build-chat && \
     find . -maxdepth 1 ! -name '.' ! -name 'dist' ! -name 'public' -exec rm -rf {} +
 
 FROM ghcr.io/1panel-dev/maxkb-base:python3.11-pg17.6 AS stage-build