fix(subsonic): Sort songs by presence of lyrics for getLyrics (#4237)

* fix(subsonic): Sort songs by presence of lyrics for `getLyrics`

The current implementation of `getLyrics` fetches any songs matching the artist and title.
However, this misses a case where there may be multiple matches for the same artist/song, and one has lyrics while the other doesn't.
Resolve this by adding a custom SQL dynamic column that checks for the presence of lyrics.

* add options to selectMediaFile, update test

* more robust testing of GetAllByLyrics

* fix(subsonic): refactor GetAllByLyrics to GetAll with lyrics sorting

Signed-off-by: Deluan <deluan@navidrome.org>

* use has_lyrics, and properly support multiple sort parts

* better handle complicated internal sorts

* just use a simpler filter

* add note to setSortMappings

* remove custom sort mapping, improve test with different updatedat

* refactor tests and mock

Signed-off-by: Deluan <deluan@navidrome.org>

* default order when not specified is `asc`

Signed-off-by: Deluan <deluan@navidrome.org>

---------

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

persistence/mediafile_repository_test.go

@@ -35,7 +35,31 @@ var _ = Describe("MediaRepository", func() {
 	})
 
 	It("counts the number of mediafiles in the DB", func() {
-		Expect(mr.CountAll()).To(Equal(int64(4)))
+		Expect(mr.CountAll()).To(Equal(int64(6)))
+	})
+
+	It("returns songs ordered by lyrics with a specific title/artist", func() {
+		// attempt to mimic filters.SongsByArtistTitleWithLyricsFirst, except we want all items
+		results, err := mr.GetAll(model.QueryOptions{
+			Sort:  "lyrics, updated_at",
+			Order: "desc",
+			Filters: squirrel.And{
+				squirrel.Eq{"title": "Antenna"},
+				squirrel.Or{
+					Exists("json_tree(participants, '$.albumartist')", squirrel.Eq{"value": "Kraftwerk"}),
+					Exists("json_tree(participants, '$.artist')", squirrel.Eq{"value": "Kraftwerk"}),
+				},
+			},
+		})
+
+		Expect(err).To(BeNil())
+		Expect(results).To(HaveLen(3))
+		Expect(results[0].Lyrics).To(Equal(`[{"lang":"xxx","line":[{"value":"This is a set of lyrics"}],"synced":false}]`))
+		for _, item := range results[1:] {
+			Expect(item.Lyrics).To(Equal("[]"))
+			Expect(item.Title).To(Equal("Antenna"))
+			Expect(item.Participants[model.RoleArtist][0].Name).To(Equal("Kraftwerk"))
+		}
 	})
 
 	It("checks existence of mediafiles in the DB", func() {