Add CMS waveform pre-processing panel with backfill endpoints

GET api/track/waveform-status and POST api/track/{id}/waveform (ApiKey);
CmsTrackService methods; TrackPreProcessing page with per-row and
sequential bulk generation; nav links from TrackList and Index.

DeepDrftManager/Services/ICmsTrackService.cs

@@ -55,4 +55,16 @@ public interface ICmsTrackService
         long id, string trackName, string artist,
         string? album, string? genre, DateOnly? releaseDate,
         CancellationToken ct = default);
+
+    /// <summary>
+    /// Fetch per-track waveform profile status from <c>GET api/track/waveform-status</c> for the
+    /// CMS PreProcessing panel. Unpaged — the admin catalogue is small.
+    /// </summary>
+    Task<ResultContainer<WaveformStatusDto[]>> GetWaveformStatusAsync(CancellationToken ct = default);
+
+    /// <summary>
+    /// Trigger waveform profile generation for a single track via
+    /// <c>POST api/track/{entryKey}/waveform</c>. Maps a 404 to a "Track audio not found." failure.
+    /// </summary>
+    Task<Result> GenerateWaveformProfileAsync(string entryKey, CancellationToken ct = default);
 }