Prevent main() from running on Spaces

app.py

@@ -885,4 +885,6 @@ else:
 
 # For local execution only (not on Spaces)
 if __name__ == "__main__":
-    main()
+    # Don't run main() on Spaces - demo is already created at module level
+    if not (os.getenv("SPACE_ID") or os.getenv("SYSTEM") == "spaces"):
+        main()