Use existing UID 1000 instead of creating new user

Dockerfile

@@ -29,22 +29,22 @@ FROM node:18-alpine AS production
 # Install dumb-init
 RUN apk add --no-cache dumb-init
 
-# Create user with UID 1000 as required by HF Spaces
-RUN adduser -S user -u 1000 -G root
+# Use existing user with UID 1000 (required by HF Spaces)
+# No need to create user - HF Spaces already has one
 
 # Set working directory
 WORKDIR /app
 
 # Copy backend dependencies and source
-COPY --from=base --chown=user /app/backend/node_modules ./backend/node_modules
-COPY --chown=user backend/ ./backend/
-COPY --chown=user data/ ./data/
+COPY --from=base --chown=1000:1000 /app/backend/node_modules ./backend/node_modules
+COPY --chown=1000:1000 backend/ ./backend/
+COPY --chown=1000:1000 data/ ./data/
 
 # Copy built frontend
-COPY --from=frontend-build --chown=user /app/frontend/dist ./frontend/dist
+COPY --from=frontend-build --chown=1000:1000 /app/frontend/dist ./frontend/dist
 
-# Switch to user
-USER user
+# Switch to user with UID 1000
+USER 1000
 
 # Expose port
 EXPOSE 3001