Fix Dockerfile: reuse node uid 1000 (GID conflict)

Dockerfile

@@ -16,7 +16,6 @@ ENV NEXT_TELEMETRY_DISABLED=1 \
     NODE_OPTIONS=--max-old-space-size=4096
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
-# Public API URL can be set as HF Space secret/variable at build or runtime rewrites
 ARG NEXT_PUBLIC_API_URL=
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 RUN npm run build
@@ -28,16 +27,11 @@ ENV NODE_ENV=production \
     PORT=7860 \
     HOSTNAME=0.0.0.0
 
-RUN groupadd --gid 1000 nodejs \
-    && useradd --uid 1000 --gid nodejs --create-home nextjs
+# node:20 image already has uid/gid 1000 (user "node") — reuse it for HF Spaces
+COPY --from=builder --chown=node:node /app/public ./public
+COPY --from=builder --chown=node:node /app/.next/standalone ./
+COPY --from=builder --chown=node:node /app/.next/static ./.next/static
 
-# Standalone output (Next.js output: 'standalone')
-COPY --from=builder --chown=nextjs:nodejs /app/public ./public
-COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
-COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
-
-USER nextjs
+USER node
 EXPOSE 7860
-
-# server.js is produced by Next standalone build
 CMD ["node", "server.js"]