fix: imports

src/plotcutter/contour.ts

@@ -1,5 +1,8 @@
 import type { CardShape, ContourPoint, ContourBounds } from './types';
 
+// 重新导出类型以兼容旧导入路径
+export type { CardShape, ContourPoint, ContourBounds };
+
 /**
  * 生成带圆角的矩形轮廓点
  * @param width 矩形宽度