feat: 2e save character initial implementation WIP

2e is hidden behind url navigation hiding, so hoping that nobody found it yet.

Note: DB migration make this commit a bit risky!

Kemkas.Web/Services/FirstEdition/Character/CharacterValidationService.cs

@@ -0,0 +1,17 @@
+using Kemkas.Web.ViewModels;
+
+namespace Kemkas.Web.Services.FirstEdition.Character;
+
+public interface ICharacterValidationService
+{
+    public string? Validate(Character1eDto dto);
+}
+
+public class CharacterValidationService : ICharacterValidationService
+{
+    public string? Validate(Character1eDto dto)
+    {
+        // TODO: add validation!!
+        return null;
+    }
+}