Refactor Api-Client

Add Exceptionhandler, AlertService JSON-Converter
AppSettings via DI

Reformat Code

Jugenddienst Stunden/Types/User.cs

@@ -1,7 +1,8 @@
 namespace Jugenddienst_Stunden.Types;
+
 internal class User {
 	public int Id { get; set; }
 	public string Name { get; set; }
 	public string Surname { get; set; }
 	public string Token { get; set; }
-}
+}