feat(waveform): generalize high-res compute to every track (Direction B)

Per-track high-res datum keyed by EntryKey in the renamed track-waveforms vault; computed at upload for all tracks, regenerable per-track via CMS, with a re-runnable backfill. Mix read path repointed so it keeps working.

DeepDrftAPI/Services/UnifiedReleaseService.cs

@@ -102,9 +102,11 @@ public class UnifiedReleaseService
     /// <summary>
     /// Fetch the Mix's track audio from the vault, compute a high-res waveform datum at a constant time
     /// resolution (≈333 samples/sec derived from the track's duration; see
-    /// <see cref="MixWaveformResolution"/>), store it in the MixWaveforms vault under the track's
+    /// <see cref="WaveformResolution"/>), store it in the TrackWaveforms vault under the track's
     /// EntryKey, then point the release's Mix satellite at that same key. The datum key equals the
-    /// track's EntryKey — the Mix is single-track.
+    /// track's EntryKey — the Mix is single-track. Under the per-track model (phase-12 §5) this is the
+    /// same datum every track now carries; the Mix satellite link is kept so the existing public
+    /// <c>GET api/release/{entryKey}/mix/waveform</c> read path keeps resolving until 12.B2 rewires it.
     /// </summary>
     public async Task<Result> TriggerMixWaveformAsync(long releaseId, CancellationToken ct)
     {
@@ -148,10 +150,10 @@ public class UnifiedReleaseService
         }
 
         // Duration-derived, constant-time-resolution capture (≈333 samples/sec) so long mixes are not
-        // under-sampled by a fixed bucket count — see MixWaveformResolution / spec §F.
-        var bucketCount = MixWaveformResolution.BucketCountForDuration(audio.Duration);
-        var computed = await _waveformProfileService.ComputeAndStoreAsync(
-            audio.Buffer, entryKey, bucketCount, VaultConstants.MixWaveforms);
+        // under-sampled by a fixed bucket count — see WaveformResolution / spec §F. Same per-track
+        // high-res datum every track now carries (phase-12 §5).
+        var computed = await _waveformProfileService.ComputeAndStoreHighResAsync(
+            audio.Buffer, entryKey, audio.Duration);
         if (!computed)
         {
             _logger.LogError("TriggerMixWaveform: waveform computation/storage failed for {EntryKey}", entryKey);