feat: normalize release-cardinal fields out of track into a Release entity (Phase 8 §8.0)

DeepDrftModels/DTOs/ReleaseDto.cs

@@ -0,0 +1,24 @@
+using DeepDrftModels.Enums;
+using Models.Models;
+
+namespace DeepDrftModels.DTOs;
+
+// Mirror of ReleaseEntity (Phase 8 §8.0). Inherits Id, CreatedAt, UpdatedAt from BaseModel
+// (Cerebellum.BlazorBlocks.Models). No `required` members — BlazorBlocks's Manager<> generic
+// constraint requires `new()`, which does not compose with required members (see TrackDto header).
+// TrackConverter assigns every field on the round-trip, so an empty default is never observable.
+public class ReleaseDto : BaseModel
+{
+    public string Title { get; set; } = string.Empty;
+    public string Artist { get; set; } = string.Empty;
+    public string? Genre { get; set; }
+    public DateOnly? ReleaseDate { get; set; }
+    public string? ImagePath { get; set; }
+    public ReleaseType ReleaseType { get; set; } = ReleaseType.Single;
+    public long? CreatedByUserId { get; set; }
+
+    // Read-model field: count of non-deleted tracks in this release. Not on ReleaseEntity — the
+    // service projects it from the joined Tracks collection so the /albums browse grid and the CMS
+    // dashboard can show a per-album track count. Defaults to 0 when not populated.
+    public int TrackCount { get; set; }
+}