Add GameVersion domain and login validation

RecNet.Domain/GameVersions/IGameVersionRepository.cs

@@ -0,0 +1,12 @@
+namespace RecNet.Domain.GameVersions;
+
+public interface IGameVersionRepository
+{
+    Task<GameVersion?> GetAsync(string version, CancellationToken ct = default);
+
+    async Task<bool> IsValidAsync(string version, CancellationToken ct = default)
+    {
+        var gameVersion = await GetAsync(version, ct);
+        return gameVersion?.IsValid == true;
+    }
+}