feat: capture and display original upload filename for tracks

DeepDrftManager/Services/CmsTrackService.cs

@@ -39,6 +39,7 @@ public class CmsTrackService : ICmsTrackService
         string? album,
         string? genre,
         string? releaseDate,
+        string? originalFileName,
         long createdByUserId,
         CancellationToken ct = default)
     {
@@ -54,6 +55,8 @@ public class CmsTrackService : ICmsTrackService
         if (!string.IsNullOrWhiteSpace(album)) multipart.Add(new StringContent(album), "album");
         if (!string.IsNullOrWhiteSpace(genre)) multipart.Add(new StringContent(genre), "genre");
         if (!string.IsNullOrWhiteSpace(releaseDate)) multipart.Add(new StringContent(releaseDate), "releaseDate");
+        // Explicit field — decouples the admin-visible display name from the WAV part's content-disposition filename.
+        if (!string.IsNullOrWhiteSpace(originalFileName)) multipart.Add(new StringContent(originalFileName), "originalFileName");
         multipart.Add(new StringContent(createdByUserId.ToString()), "createdByUserId");
 
         var client = _httpClientFactory.CreateClient(ContentCmsClientName);

DeepDrftManager/Services/ICmsTrackService.cs

@@ -15,6 +15,8 @@ public interface ICmsTrackService
     /// Proxy a WAV upload to DeepDrftAPI. The Content API owns the dual-database write and
     /// returns the persisted track carrying the SQL-assigned <c>Id</c>. A vault-without-SQL
     /// orphan is handled and logged server-side; here it surfaces as a failed result.
+    /// <paramref name="originalFileName"/> is the browser's filename, captured at upload time and
+    /// stored as metadata; it is not user-editable afterwards.
     /// </summary>
     Task<ResultContainer<TrackDto>> UploadTrackAsync(
         Stream wavStream,
@@ -25,6 +27,7 @@ public interface ICmsTrackService
         string? album,
         string? genre,
         string? releaseDate,
+        string? originalFileName,
         long createdByUserId,
         CancellationToken ct = default);