move startup call to main to prep for pytests

app.py

@@ -107,9 +107,10 @@ with gr.Blocks(
         "**MCP-compatible!** Simply add `n8cha/prompt-roulette` to your list in https://hf.co/settings/mcp to expose it as a convenient tool for your AI conversation partner."
     )
 
-demo.queue(
-    max_size=5,  # Maximum number of requests in queue
-    default_concurrency_limit=1  # Maximum concurrent API calls
-)
+if __name__ == "__main__":
+    demo.queue(
+        max_size=5,  # Maximum number of requests in queue
+        default_concurrency_limit=1  # Maximum concurrent API calls
+    )
 
-demo.launch(mcp_server=True)
+    demo.launch(mcp_server=True)