Refactor entry point, consolidate app creation, update main block, simplify Gradio init

app.py

@@ -553,12 +553,7 @@ def create_app():
     return demo
 
 
-def main():
-    """Create and launch the Gradio app."""
-    app = create_app()
-    # CSS is passed to launch() in Gradio 6+
-    app.launch()
-
+demo = create_app()
 
 if __name__ == "__main__":
-    main()
+    demo.launch()