Introduces the AlbumAssetAdded workflow trigger and a new AssetAlbumV1
workflow type that carries album context (id, owner, name, description)
alongside the asset, mirroring AssetPersonV1. A new AlbumAssetAdd event
is emitted from AlbumService when assets are added to an album (both
addAssets and addAssetsToAlbums), and WorkflowExecutionService queues
the workflow trigger with the album id so steps can act on a specific
album.