♻️ refactor(GoodsManagement): 移除冗余的显示控制容器

- 删除包裹父子商品管理面板的冗余 `<div>` 容器及其 `display` 样式控制
- 保留原有的 `.mt-6.pt-6.border-t` 容器，确保样式和布局不变

packages/goods-management-ui-mt/src/components/GoodsManagement.tsx

@@ -896,7 +896,6 @@ export const GoodsManagement: React.FC = () => {
           )}
 
           {/* 父子商品管理面板 - 移到表单下方 */}
-          <div style={{ display: isVisible ? 'block' : 'none' }}>
           <div className="mt-6 pt-6 border-t">
             <GoodsParentChildPanel
               mode={isCreateForm ? 'create' : 'edit'}
@@ -911,7 +910,6 @@ export const GoodsManagement: React.FC = () => {
               disabled={isCreateForm ? createMutation.isPending : updateMutation.isPending}
             />
           </div>
-          </div>
 
           {/* 对话框底部按钮 */}
           <DialogFooter>