Add WebSocket broadcast to KOReader progress sync:
- Integrate ConnectionManager into KOReaderHandler
- Broadcast progress updates on successful sync
- Include source device information (model, type)
- Real-time updates to all connected clients
When KOReader devices sync reading progress, all connected
WebSocket clients (web browsers, mobile apps, other devices)
receive instant updates.
- Create SyncProgress for bidirectional progress synchronization
- Create GetMetadata for book progress and annotation retrieval
- Create GetLibrary for user library sync
- Create SyncBookmarks for annotation management
- Support device matching by UUID, file path, or title/author
- Implement immediate and checkpoint sync modes
- Handle bookmarks, highlights, and notes synchronization
- Part of Phase 3 KOReader Integration implementation
john-okeefe