feat: include TotalHoursPlayed in ValidateTesterAccessResponse

Adds TotalHoursPlayed to the access validation response, allowing clients to see the tester's name and total playtime in hours.
This enhances visibility for game clients without changing existing validation logic.

Author: DevD4v3

src/UseCases/Testers/ValidateAccess.cs

@@ -8,7 +8,7 @@
 namespace Playtesters.API.UseCases.Testers;
 
 public record ValidateTesterAccessRequest(string AccessKey);
-public record ValidateTesterAccessResponse(string Name);
+public record ValidateTesterAccessResponse(string Name, double TotalHoursPlayed);
 
 public class ValidateTesterAccessValidator 
     : AbstractValidator<ValidateTesterAccessRequest>
@@ -54,7 +54,7 @@ public async Task<Result<ValidateTesterAccessResponse>> ExecuteAsync(
         dbContext.Add(accessHistory);
         await dbContext.SaveChangesAsync();
 
-        var response = new ValidateTesterAccessResponse(tester.Name);
+        var response = new ValidateTesterAccessResponse(tester.Name, tester.TotalHoursPlayed);
         return Result.Success(response);
     }
 }