🚀 Fix: Dockerfile user conflict (using node user)

frontend/Dockerfile

@@ -18,24 +18,21 @@ RUN npm run build
 # Production stage
 FROM node:18-alpine
 
-# Create app user (required for HF Spaces security)
-RUN addgroup -g 1000 user && adduser -u 1000 -G user -s /bin/sh -D user
-
 WORKDIR /app
 
 # Copy built application from builder
-COPY --from=builder --chown=user:user /app/.next ./.next
-COPY --from=builder --chown=user:user /app/public ./public
-COPY --from=builder --chown=user:user /app/node_modules ./node_modules
-COPY --from=builder --chown=user:user /app/package*.json ./
-COPY --from=builder --chown=user:user /app/next.config.js ./
+COPY --from=builder --chown=node:node /app/.next ./.next
+COPY --from=builder --chown=node:node /app/public ./public
+COPY --from=builder --chown=node:node /app/node_modules ./node_modules
+COPY --from=builder --chown=node:node /app/package*.json ./
+COPY --from=builder --chown=node:node /app/next.config.js ./
 
 # Set environment
 ENV NODE_ENV=production \
     NEXT_TELEMETRY_DISABLED=1
 
 # Switch to non-root user
-USER user
+USER node
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \