Fix port configuration for Hugging Face Spaces

Use port 7860 in production environment to match HF Spaces expectations.
Local development still uses port 5000.

server/index.ts

@@ -174,7 +174,7 @@ app.use((req, res, next) => {
 
   // Serve the app on the configured port (5000 for local, 7860 for HF Spaces)
   // this serves both the API and the client.
-  const port = process.env.PORT ? parseInt(process.env.PORT) : 5000;
+  const port = process.env.PORT ? parseInt(process.env.PORT) : (process.env.NODE_ENV === 'production' ? 7860 : 5000);
   server.listen({
     port,
     host: "0.0.0.0",