feat: 优化导出功能，清除选中状态以避免导出问题，调整裁剪路径以保持准确性

src/component/Canvas/CanvasEditor/managers/ExportManager.js

@@ -263,7 +263,8 @@ export class ExportManager {
 
     // 递归收集子图层的对象
     if (layer.children && layer.children.length > 0) {
-      for (const childLayer of layer.children) {
+      for (let i = layer.children.length - 1; i >= 0; i--) {
+        const childLayer = layer.children[i];
         const childObjects = this._collectObjectsFromLayer(childLayer);
         realObjects.push(...childObjects);
       }