Update app.py

app.py

@@ -98,4 +98,5 @@ def health_check():
 
 if __name__ == '__main__':
     logger.info("Starting grammar services...")
-    app.run(host='0.0.0.0', port=8080, debug=True)
+    port = int(os.environ.get("PORT", 7860))  # Default fallback port
+    app.run(host='0.0.0.0', port=port, debug=True)