feat: DTOs and interfaces

Services/Interfaces/IRewardService.cs

@@ -0,0 +1,11 @@
+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IRewardService
+{
+    Task<IEnumerable<MissionSkillReward>> GetMissionSkillRewardsAsync(Guid missionId);
+    Task<IEnumerable<MissionItemReward>> GetMissionItemRewardsAsync(Guid missionId);
+    Task DistributeMissionRewardsAsync(Guid missionId, Guid playerId);
+    Task<bool> CanClaimRewardAsync(Guid rewardId, Guid playerId);
+}