Merge branch 'backend-refactor-rev' into audit-merge-three

Adapt the refactored web player to the new backend API (id path params,
bulk track adds, flat list items, mix kind) and port AddAlbumToPlayList
to the backend conventions.

backend/Hosts/Musify.Worker/appsettings.Development.json

@@ -26,10 +26,11 @@
     "ApplicationStorage": {
         "Bucket": "webapi-storage"
     },
-    "AudioTranscoder": {
-        "Routes": {
-            "WorkingDirectory": "../../../deploy/.tmp"
-        }
+    "StreamGateway": {
+        "PublicBaseUrl": "http://localhost:8081"
+    },
+    "StreamTicket": {
+        "PrivateKeyPath": "../../../deploy/keys/stream_private.pem"
     },
     "Workers": {
         "Routes": {