feat(server): add index-based play queue endpoints to native API (#4210)

* Add migration converting playqueue current to index

* refactor

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

* fix(queue): ensure valid current index and improve test coverage

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

---------

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

server/nativeapi/native_api.go

@@ -60,6 +60,7 @@ func (n *Router) routes() http.Handler {
 		n.addPlaylistRoute(r)
 		n.addPlaylistTrackRoute(r)
 		n.addSongPlaylistsRoute(r)
+		n.addQueueRoute(r)
 		n.addMissingFilesRoute(r)
 		n.addInspectRoute(r)
 		n.addConfigRoute(r)
@@ -152,6 +153,13 @@ func (n *Router) addSongPlaylistsRoute(r chi.Router) {
 	})
 }
 
+func (n *Router) addQueueRoute(r chi.Router) {
+	r.Route("/queue", func(r chi.Router) {
+		r.Get("/", getQueue(n.ds))
+		r.Post("/", saveQueue(n.ds))
+	})
+}
+
 func (n *Router) addMissingFilesRoute(r chi.Router) {
 	r.Route("/missing", func(r chi.Router) {
 		n.RX(r, "/", newMissingRepository(n.ds), false)