Добавил слой Application

backend/UniVerse.Application/DTOs/Gamification/GamificationDtos.cs

@@ -0,0 +1,13 @@
+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Gamification;
+
+public record CoinTransactionDto(
+    int Id,
+    int Amount,
+    CoinTransactionType Type,
+    int? ReviewId,
+    int? AchievementId,
+    string? Description,
+    DateTime CreatedAt
+);