feat: add index.ts for modification tools

frontend/src/tools/modification/index.ts

@@ -0,0 +1,21 @@
+export { MoveTool } from './MoveTool';
+export { CopyTool } from './CopyTool';
+export { RotateTool } from './RotateTool';
+export { ScaleTool } from './ScaleTool';
+export { MirrorTool } from './MirrorTool';
+export { TrimTool } from './TrimTool';
+export { ExtendTool } from './ExtendTool';
+export { FilletTool } from './FilletTool';
+export { OffsetTool } from './OffsetTool';
+
+export const modificationTools = [
+  MoveTool,
+  CopyTool,
+  RotateTool,
+  ScaleTool,
+  MirrorTool,
+  TrimTool,
+  ExtendTool,
+  FilletTool,
+  OffsetTool
+];