Fix: disable SSR mode and use port 7860 to unblock HF Spaces startup

SSR (Server-Side Rendering) in Gradio 5 launches a Node.js pre-render
process that hangs indefinitely in HF Spaces containers, keeping the
Space in "Starting" state forever. Disabling it makes the app ready
immediately after Gradio binds the port.

Port changed from 9001 to 7860 (standard HF Spaces Gradio port).

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

app.py

@@ -622,8 +622,9 @@ if __name__ == "__main__":
 
     demo = build_ui()
     demo.launch(
-        server_port=9001,
-        inbrowser=True,
+        server_port=7860,  # HF Spaces standard port
+        inbrowser=False,
         share=False,
-        show_api=False,   # disables /info endpoint that crashes on Gradio 5.9.1 schema bug
+        show_api=False,
+        ssr_mode=False,    # SSR starts a Node.js process that hangs in HF Spaces containers
     )