Fix: Remove missing websocket import, fix permissions, use Python HTTP server for frontend

Dockerfile

@@ -26,7 +26,9 @@ RUN pip3 install --no-cache-dir --break-system-packages \
 
 # Simple startup script
 COPY start.sh /app/
-RUN chmod +x /app/start.sh
+
+# Fix permissions for node user
+RUN chown -R node:node /app && chmod +x /app/start.sh
 
 # Switch to node user (UID 1000 already exists in node image)
 USER node

backend/app/api/__init__.py

@@ -1,5 +1,4 @@
 """API package."""
 from .routes import router
-from .websocket import handle_visualization, manager
 
-__all__ = ["router", "handle_visualization", "manager"]
+__all__ = ["router"]

start.sh

@@ -4,6 +4,6 @@
 cd /app/backend
 python3 -m uvicorn app.main:app --host 0.0.0.0 --port 8000 &
 
-# Start frontend dev server on port 7860
-cd /app/frontend
-npm run preview -- --host 0.0.0.0 --port 7860
+# Serve frontend built files using Python's HTTP server on port 7860
+cd /app/frontend/dist
+python3 -m http.server 7860