Update README.md

Author: woshimajintao

annotation_tool/ui/classification/README.md

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 This directory contains the specific user interface components designed for the **Whole-Video Classification** task.
 
 Unlike the previous monolithic structure, this module is split into two specialized sub-packages (`event_editor` and `media_player`) that plug into the application's common workspace.
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 ## 📂 Directory Structure