Fix: Remove duplicate UID 1000 user creation, use existing node user

Dockerfile

@@ -10,34 +10,31 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     python3-venv \
     && rm -rf /var/lib/apt/lists/*
 
-# Create user with UID 1000 (required by HF Spaces)
-RUN useradd -m -u 1000 user
-
 WORKDIR /app
 
 # Copy and build frontend
-COPY --chown=user frontend/package*.json ./frontend/
+COPY frontend/package*.json ./frontend/
 RUN cd frontend && npm ci
-COPY --chown=user frontend/ ./frontend/
+COPY frontend/ ./frontend/
 RUN cd frontend && npm run build
 
 # Copy and install backend
-COPY --chown=user backend/ ./backend/
+COPY backend/ ./backend/
 RUN pip3 install --no-cache-dir --break-system-packages \
     fastapi uvicorn pydantic pydantic-settings \
     httpx psutil python-dotenv websockets
 
-# Switch to non-root user
-USER user
+# Simple startup script
+COPY start.sh /app/
+RUN chmod +x /app/start.sh
+
+# Switch to node user (UID 1000 already exists in node image)
+USER node
 
-ENV HOME=/home/user \
+ENV HOME=/home/node \
     PYTHONPATH=/app/backend \
     PYTHONUNBUFFERED=1
 
 EXPOSE 7860
 
-# Simple startup script
-COPY --chown=user start.sh /app/
-RUN chmod +x /app/start.sh
-
 CMD ["/app/start.sh"]