[Feat]: 从外部拖拽一个html到自定义节点上没有触发节点的node:drop,node:pointerenter等事件

### Describe the feature / 功能描述

希望支持从Canvas外部拖拽html到节点上的相关事件，现在是通过监听画布所在的html的drop事件然后通过坐标去找对应的目标节点，在拖拽过程中想要加拖拽的effect的话每次都要根据坐标找节点性能就不太好，所以希望node的相关事件不止是通过内部节点触发

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

Please select / 请选择

The issue does not name files, tests, or an entry point. Start by reviewing the canvas-level HTML drop handling and the coordinate-based target lookup described in the issue. Done means dragging HTML from outside the canvas can trigger node:drop and node:pointerenter on the target node without requiring repeated coordinate lookup.

Written by the indexing model from the issue text.