Store each client's play queue in the database

The queue lived in memory and was shared by all clients, so a restart or a
finished sync cleared it. Every client now has its own queue in the new
queue and queue_song tables (added to the undeployed migration 000006).

The music endpoints return the queue ID in the X-Queue-Id header and expect
it back. A request without an ID, or with an ended one, starts a new queue.
/music/reset ends the queue and returns a new ID, and a sync ends all
running queues. Ended queues are kept as history.

The deprecated legacy routes without the /api/v1 prefix are removed.

internal/server/sync_handler.go

@@ -11,8 +11,8 @@ import (
 	"github.com/danielgtaylor/huma/v2"
 )
 
-func (s *Server) registerSync(a apis) {
-	registry := a.v1.OpenAPI().Components.Schemas
+func (s *Server) registerSync(a huma.API) {
+	registry := a.OpenAPI().Components.Schemas
 	progress := huma.Operation{
 		OperationID: "get-sync-progress",
 		Method:      http.MethodGet,
@@ -30,7 +30,7 @@ func (s *Server) registerSync(a apis) {
 			},
 		},
 	}
-	register(s, a, route{op: progress, legacyPath: "/sync/progress"},
+	register(s, a, route{op: progress},
 		func(ctx context.Context, _ *struct{}) (*jsonBody[any], error) {
 			if s.sync.IsSyncing() {
 				return ok[any](s.sync.Progress(), nil)
@@ -49,7 +49,6 @@ func (s *Server) registerSync(a apis) {
 				Tags:        []string{"sync"},
 				Errors:      []int{http.StatusLocked},
 			},
-			legacyPath: path,
 		}, func(ctx context.Context, _ *struct{}) (*jsonBody[string], error) {
 			message := "Start syncing soundtracks"
 			if full {
@@ -78,7 +77,7 @@ func (s *Server) registerSync(a apis) {
 		Tags:        []string{"sync"},
 		Hidden:      true,
 	}
-	register(s, a, route{op: reset, legacyPath: "/sync/reset", locked: true},
+	register(s, a, route{op: reset, locked: true},
 		func(ctx context.Context, _ *struct{}) (*jsonBody[string], error) {
 			logging.GetLogger().Info("Resetting soundtracks database")
 			return ok("Soundtracks and songs are deleted from the database", s.sync.ResetDB(ctx))