Add GameVersion domain and login validation

RecNet.Infrastructure/Persistence/Repositories/GameVersionRepository.cs

@@ -0,0 +1,11 @@
+using Microsoft.EntityFrameworkCore;
+using RecNet.Domain.GameVersions;
+
+namespace RecNet.Infrastructure.Persistence.Repositories;
+
+public class GameVersionRepository(DatabaseContext dbContext) : IGameVersionRepository
+{
+    public Task<GameVersion?> GetAsync(string version, CancellationToken ct = default)
+        => dbContext.GameVersions
+            .FirstOrDefaultAsync(x => x.Version == version, ct);
+}