Refactor Api-Client

Add Exceptionhandler, AlertService JSON-Converter
AppSettings via DI

Reformat Code

Jugenddienst Stunden/Types/Gemeinde.cs

@@ -13,4 +13,4 @@ public class Gemeinde {
 	/// Name der Gemeinde.
 	/// </summary>
 	public string? Name { get; set; }
-}
+}