feat(release): front int PK with app-minted GUID EntryKey on the public addressing surface (P11 W5, 11.H)

DeepDrftModels/Entities/ReleaseEntity.cs

@@ -12,6 +12,12 @@ namespace DeepDrftModels.Entities;
 // explicitly to satisfy the generic constraints on Repository<>/Manager<>/etc.
 public class ReleaseEntity : BaseEntity, IEntity
 {
+    // App-minted GUID-string public handle, mirroring TrackEntity.EntryKey exactly: required string,
+    // entry_key column, unique index, born app-side as Guid.NewGuid().ToString() at release creation
+    // (the FindOrCreateRelease path). Fronts the int Id (the DB-only PK, unused by the app) so the
+    // public site/API address releases by an opaque key, never the transparent sequential id
+    // (Phase 11 §3e). Unlike a track's EntryKey it has no vault job — it is purely an identifier.
+    public required string EntryKey { get; set; }
     public required string Title { get; set; }
     public required string Artist { get; set; }
     public string? Genre { get; set; }