fix: Remove server_name arg from app.py for HF Spaces compatibility

app.py

@@ -2,4 +2,4 @@ from app_module import get_llm, build_demo
 
 if __name__ == "__main__":
     get_llm()
-    build_demo().launch(server_name="0.0.0.0")
+    build_demo().launch()