Refactor app.py to launch iface.queue within a main guard for better script execution

app.py

@@ -587,4 +587,5 @@ with gr.Blocks(theme=gr.themes.Soft()) as iface:
         concurrency_limit=1,
     )
 
-iface.queue(max_size=64).launch(share=True)
+if __name__ == "__main__":
+    iface.queue(max_size=64, default_concurrency_limit=1).launch(share=True)