Remove ssr_mode=False and stale css kwarg from launch()

In Gradio 6.x, ssr_mode=False disables server-side rendering — if the
JS bundle fails to load inside the HF iframe, the page is completely
blank. Removing it restores the default SSR behaviour. css was already
moved to gr.Blocks(css=css).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -1150,9 +1150,7 @@ with gr.Blocks(css=css) as demo:
 
 if __name__ == "__main__":
     demo.queue(max_size=30).launch(
-        css=css,
         mcp_server=True,
-        ssr_mode=False,
         show_error=True,
         allowed_paths=["examples"],
     )