- Update api-reference.md with current endpoint list
- Update bulk_update_books.md with improved documentation
- Update scanner/overview.md to reference scan_library.md
- Rename ScanEbooks method to ScanLibrary to reflect generic media scanning
- Rename ScanEbooksRequest to ScanLibraryRequest
- Update route handlers in scanner.go and library.go
- Rename scan_ebooks.md to scan_library.md
- No breaking changes: API endpoint remains POST /api/scanner/scan