Fix port configuration: default to 7860 for Hugging Face Spaces

start.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # Start script for production: uses gunicorn to serve the Flask app
-# Bind to the PORT environment variable (set by hosting platforms). Defaults to 5000.
-PORT=${PORT:-5000}
+# Bind to the PORT environment variable (set by hosting platforms). Defaults to 7860.
+PORT=${PORT:-7860}
 
 echo "Starting gunicorn on 0.0.0.0:${PORT}..."
 exec gunicorn --bind 0.0.0.0:${PORT} --workers 1 --threads 4 --timeout 120 app:app