feat: add AuditableEntity and SoftDeleteEntity base classes

API/ROLAC.API/Entities/Base/AuditableEntity.cs

@@ -0,0 +1,9 @@
+namespace ROLAC.API.Entities.Base;
+
+public abstract class AuditableEntity
+{
+    public DateTime CreatedAt { get; set; }
+    public string CreatedBy { get; set; } = null!;   // FK → AspNetUsers.Id
+    public DateTime UpdatedAt { get; set; }
+    public string UpdatedBy { get; set; } = null!;   // FK → AspNetUsers.Id
+}

API/ROLAC.API/Entities/Base/SoftDeleteEntity.cs

@@ -0,0 +1,8 @@
+namespace ROLAC.API.Entities.Base;
+
+public abstract class SoftDeleteEntity : AuditableEntity
+{
+    public bool     IsDeleted  { get; set; } = false;
+    public DateTime? DeletedAt { get; set; }
+    public string?   DeletedBy { get; set; }          // FK → AspNetUsers.Id
+}