v2.7.7

• Architecture: Complete refactoring to layered architecture (core/model/services/view) with SOLID principles
• Tech Stack: Modernized to SQLAlchemy 2.x ORM, Pydantic config, loguru logging
• UI: Upgraded to qfluentwidgets Fluent Design component library, table views now use native TableView/TableItemDelegate for consistent dark/light theming
• Task Queue: New unified scheduling with real-time progress tracking
• Auto Sync: Dashboard with configurable watch folders and background sync
• System Tray: Minimize to tray, continue syncing in background
• Full-Text Search: Whoosh-powered search with Chinese word segmentation (jieba)
• i18n: Full translation coverage across 5 languages (zh_CN, de, fr, ru, ko)
• Theme: Fixed dark theme header white-on-white issue in list view
• Packaging: Cleaned up about page, updated installer with proper startup task handling