feat(annotation): add serialization support

src/components/index.ts

@@ -31,8 +31,4 @@ export type { WaveformGridOptions as WaveformGridConfig } from './core/grid'
 // 可选：导出各系统的组件（供高级用户使用）
 export { WaveformTooltip } from './interaction'
 export { WaveformTrack } from './rendering'
-export {
-  WaveformAnnotationLayer,
-  WaveformAnnotationToolbar,
-  WaveformAnnotationContextMenu,
-} from './annotation'
+export { WaveformAnnotationLayer, WaveformAnnotationContextMenu } from './annotation'