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.

DeepDrftManager/Services/CmsTrackService.cs

@@ -501,6 +501,39 @@ public class CmsTrackService : ICmsTrackService
         }
     }
 
+    public async Task<Result> GenerateHighResWaveformAsync(string entryKey, CancellationToken ct = default)
+    {
+        var client = _httpClientFactory.CreateClient(ContentCmsClientName);
+
+        HttpResponseMessage response;
+        try
+        {
+            response = await client.PostAsync($"api/track/{Uri.EscapeDataString(entryKey)}/waveform/high-res", null, ct);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Content API call failed for high-res waveform generation of {EntryKey}", entryKey);
+            return Result.CreateFailResult("Content API is unreachable.");
+        }
+
+        using (response)
+        {
+            if (response.IsSuccessStatusCode)
+            {
+                return Result.CreatePassResult();
+            }
+
+            if (response.StatusCode == HttpStatusCode.NotFound)
+            {
+                return Result.CreateFailResult("Track audio not found.");
+            }
+
+            var body = await response.Content.ReadAsStringAsync(ct);
+            _logger.LogError("Content API high-res waveform generation failed for {EntryKey}: {Status} {Body}", entryKey, (int)response.StatusCode, body);
+            return Result.CreateFailResult("Failed to generate high-res waveform datum.");
+        }
+    }
+
     public async Task<ResultContainer<List<ReleaseDto>>> GetReleasesAsync(CancellationToken ct = default)
     {
         var client = _httpClientFactory.CreateClient(ContentCmsClientName);

DeepDrftManager/Services/ICmsTrackService.cs

@@ -105,6 +105,14 @@ public interface ICmsTrackService
     /// </summary>
     Task<Result> GenerateWaveformProfileAsync(string entryKey, CancellationToken ct = default);
 
+    /// <summary>
+    /// Trigger high-res visualizer datum generation for a single track via
+    /// <c>POST api/track/{entryKey}/waveform/high-res</c> (phase-12 §5). Re-runnable — recomputes on each
+    /// call. Drives the per-row generate action and the batch backfill. Maps a 404 to a "Track audio not
+    /// found." failure.
+    /// </summary>
+    Task<Result> GenerateHighResWaveformAsync(string entryKey, CancellationToken ct = default);
+
     /// <summary>Returns all releases with track counts from GET api/track/albums.</summary>
     Task<ResultContainer<List<ReleaseDto>>> GetReleasesAsync(CancellationToken ct = default);