от src избавился

backend/Tnsu.ApprovalRoute.Application/Common/Errors/Errors.cs

@@ -0,0 +1,10 @@
+using FluentResults;
+
+namespace Tnsu.ApprovalRoute.Application.Common.Errors;
+
+public sealed class NotFoundError(string entity, object id)
+    : Error($"{entity} с id {id} не найден.");
+
+public sealed class ValidationError(string message) : Error(message);
+
+public sealed class ConflictError(string message) : Error(message);