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/CmsTrackService.cs

@@ -281,4 +281,81 @@ public class CmsTrackService : ICmsTrackService
             return Result.CreateFailResult("Failed to update track.");
         }
     }
+
+    public async Task<ResultContainer<WaveformStatusDto[]>> GetWaveformStatusAsync(CancellationToken ct = default)
+    {
+        var client = _httpClientFactory.CreateClient(ContentCmsClientName);
+
+        HttpResponseMessage response;
+        try
+        {
+            response = await client.GetAsync("api/track/waveform-status", ct);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Content API call failed for waveform status");
+            return ResultContainer<WaveformStatusDto[]>.CreateFailResult("Content API is unreachable.");
+        }
+
+        using (response)
+        {
+            if (!response.IsSuccessStatusCode)
+            {
+                _logger.LogError("Content API waveform status failed: {Status}", (int)response.StatusCode);
+                return ResultContainer<WaveformStatusDto[]>.CreateFailResult("Failed to load waveform status.");
+            }
+
+            WaveformStatusDto[]? status;
+            try
+            {
+                status = await response.Content.ReadFromJsonAsync<WaveformStatusDto[]>(ct);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Failed to deserialize waveform status from Content API response");
+                return ResultContainer<WaveformStatusDto[]>.CreateFailResult("Content API returned an unexpected response.");
+            }
+
+            if (status is null)
+            {
+                _logger.LogError("Content API returned a null waveform status list");
+                return ResultContainer<WaveformStatusDto[]>.CreateFailResult("Content API returned an empty response.");
+            }
+
+            return ResultContainer<WaveformStatusDto[]>.CreatePassResult(status);
+        }
+    }
+
+    public async Task<Result> GenerateWaveformProfileAsync(string entryKey, CancellationToken ct = default)
+    {
+        var client = _httpClientFactory.CreateClient(ContentCmsClientName);
+
+        HttpResponseMessage response;
+        try
+        {
+            response = await client.PostAsync($"api/track/{Uri.EscapeDataString(entryKey)}/waveform", null, ct);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Content API call failed for 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 waveform generation failed for {EntryKey}: {Status} {Body}", entryKey, (int)response.StatusCode, body);
+            return Result.CreateFailResult("Failed to generate waveform profile.");
+        }
+    }
 }