Get album info (when available) from Last.fm, add getAlbumInfo endpoint (#2061)

* lastfm album.getInfo, getAlbuminfo(2) endpoints

* ... for description and reduce not found log level

* address first comments

* return all images

* Update migration timestamp

* Handle a few edge cases

* Add CoverArtPriority option to retrieve albumart from external sources

* Make agents methods more descriptive

* Use Last.fm name consistently

Co-authored-by: Deluan <deluan@navidrome.org>

server/subsonic/browsing.go

@@ -154,6 +154,7 @@ func (api *Router) GetArtist(r *http.Request) (*responses.Subsonic, error) {
 
 func (api *Router) GetAlbum(r *http.Request) (*responses.Subsonic, error) {
 	id := utils.ParamString(r, "id")
+
 	ctx := r.Context()
 
 	album, err := api.ds.Album(ctx).Get(id)
@@ -177,6 +178,32 @@ func (api *Router) GetAlbum(r *http.Request) (*responses.Subsonic, error) {
 	return response, nil
 }
 
+func (api *Router) GetAlbumInfo(r *http.Request) (*responses.Subsonic, error) {
+	id, err := requiredParamString(r, "id")
+	ctx := r.Context()
+
+	if err != nil {
+		return nil, err
+	}
+
+	album, err := api.externalMetadata.UpdateAlbumInfo(ctx, id)
+
+	if err != nil {
+		return nil, err
+	}
+
+	response := newResponse()
+	response.AlbumInfo = &responses.AlbumInfo{}
+	response.AlbumInfo.Notes = album.Description
+	response.AlbumInfo.SmallImageUrl = album.SmallImageUrl
+	response.AlbumInfo.MediumImageUrl = album.MediumImageUrl
+	response.AlbumInfo.LargeImageUrl = album.LargeImageUrl
+	response.AlbumInfo.LastFmUrl = album.ExternalUrl
+	response.AlbumInfo.MusicBrainzID = album.MbzAlbumID
+
+	return response, nil
+}
+
 func (api *Router) GetSong(r *http.Request) (*responses.Subsonic, error) {
 	id := utils.ParamString(r, "id")
 	ctx := r.Context()
@@ -397,7 +424,6 @@ func (api *Router) buildAlbum(ctx context.Context, album *model.Album, mfs model
 	if album.Starred {
 		dir.Starred = &album.StarredAt
 	}
-
 	dir.Song = childrenFromMediaFiles(ctx, mfs)
 	return dir
 }