Export and sync Douban (豆瓣) book/movie/music/game collections to local CSV files (Obsidian-compatible). Use when the user wants to export their Douban reading/watching/listening/gaming history, set up incremental sync via RSS, or manage their Douban data locally.

将豆瓣的书籍、电影、音乐、游戏收藏导出并同步为本地CSV文件（兼容Obsidian）。适用于用户导出其豆瓣阅读、观影、听歌、玩游戏历史，通过RSS设置增量同步，或在本地管理豆瓣数据。