Sync Bunpro Japanese grammar learning progress from the API to local storage for analysis and insights. Use when the user wants to backup their Bunpro progress, track grammar mastery, analyze review patterns, or monitor JLPT level progression. Works with the community-documented Bunpro Frontend API.

通过 Bunpro 前端 API 将日语语法学习进度同步至本地存储，用于分析和洞察。适用于用户备份 Bunpro 学习进度、跟踪语法掌握情况、分析复习模式或监控 JLPT 等级进展。兼容社区文档化的 Bunpro 前端 API。