Make release Medium writable via upload + meta-edit; resolve detail-page track by releaseId not album title

DeepDrftManager/Services/CmsTrackService.cs

@@ -64,8 +64,8 @@ public class CmsTrackService : ICmsTrackService
         multipart.Add(new StringContent(createdByUserId.ToString()), "createdByUserId");
         multipart.Add(new StringContent(releaseType.ToString()), "releaseType");
         multipart.Add(new StringContent(trackNumber.ToString()), "trackNumber");
-        // Forward-compatible: the upload endpoint does not bind a "medium" field yet (server defaults
-        // to Cut). Sent so the value round-trips once the API grows the parameter; ignored until then.
+        // The upload endpoint binds "medium" to the created release's ReleaseMedium (defaulting to Cut
+        // for an unrecognised value). Authoritative only when this upload creates the release.
         multipart.Add(new StringContent(medium.ToString()), "medium");
 
         var client = _httpClientFactory.CreateClient(ContentCmsClientName);
@@ -374,6 +374,7 @@ public class CmsTrackService : ICmsTrackService
         string? album, string? genre, DateOnly? releaseDate,
         string? imagePath = null,
         ReleaseType? releaseType = null,
+        ReleaseMedium? medium = null,
         int? trackNumber = null,
         CancellationToken ct = default)
     {
@@ -387,6 +388,7 @@ public class CmsTrackService : ICmsTrackService
             releaseDate,
             imagePath,
             releaseType = releaseType.HasValue ? (int?)releaseType.Value : null,
+            medium = medium.HasValue ? (int?)medium.Value : null,
             trackNumber,
         };