- Added multi-library filtering to GetRandomSongs endpoint using musicFolderId parameter
- Added multi-library filtering to GetSongsByGenre endpoint using musicFolderId parameter
- Enhanced GetStarred and GetStarred2 to filter artists, albums, and songs by library
- Added Options field to MockMediaFileRepo and MockArtistRepo for test compatibility
- Added comprehensive Ginkgo/Gomega tests for all new multi-library functionality
- All tests verify proper SQL filter generation and library access validation
- Supports single/multiple musicFolderId values with fallback to all accessible libraries