Fix Express trust proxy for Hugging Face Spaces

Enable trust proxy in production to properly handle X-Forwarded-For
headers from HF Spaces infrastructure and fix rate limiting.

server/index.ts

@@ -35,6 +35,11 @@ config({ path: join(__dirname, '../.env') });
 
 const app = express();
 
+// Trust proxy for Hugging Face Spaces infrastructure
+if (process.env.NODE_ENV === 'production') {
+  app.set('trust proxy', true);
+}
+
 console.log("✅ Express app created");
 
 // IMMEDIATE fallback route - ensures HF Spaces gets a response no matter what