fix: use Railway PORT env var for dynamic port binding

start.sh

@@ -3,5 +3,8 @@ cd /flask
 echo "Working directory: $(pwd)"
 echo "Checking assets files:"
 ls -la assets*.json 2>&1 || echo "No assets files found"
-echo "Starting gunicorn..."
-exec gunicorn -w 2 -b 0.0.0.0:8000 --timeout 120 main:app
+
+# Use Railway's PORT env var if available, otherwise default to 8000
+PORT=${PORT:-8000}
+echo "Starting gunicorn on port $PORT..."
+exec gunicorn -w 2 -b 0.0.0.0:$PORT --timeout 120 main:app