[Feat]: 支持自定义React/Vue节点在minimap显示

### Describe the feature / 功能描述

目前可以通过自定义shape可以支持自定义React/Vue节点在minimap显示（不知道还有有哪些潜在问题）

plugins: [
{
type: 'minimap',
shape: (id, elType, target) => {
if (target.constructor.name === 'VueNode' || target.constructor.name === 'ReactNode') {
return target;
}
return target.getShape('key').cloneNode(true);
},
},
]
希望在minimap中添加 canvas.destroyChildren();保证自定义React/Vue节点卸载

### Are you willing to contribute? / 是否愿意参与贡献？

✅ Yes / 是

The issue points to the minimap plugin's custom shape callback and requests canvas.destroyChildren() so custom React/Vue nodes are unloaded. Start by locating the minimap implementation and tracing how custom nodes are created and removed. Done means custom nodes unload correctly without breaking ordinary minimap shapes; no file or test is named in the issue.

Written by the indexing model from the issue text.