fix: 删除冗余代码

src/views/graph/index.ts

@@ -1,5 +1,4 @@
 import { Graph, FunctionExt, Shape, Addon } from '@antv/x6'
-import ContextMenu from '@imengyu/vue3-context-menu'
 
 import insertCss from 'insert-css'
 import './shape'