Refactor Api-Client

Add Exceptionhandler, AlertService JSON-Converter
AppSettings via DI

Reformat Code

Jugenddienst Stunden/Interfaces/IAppSettings.cs

@@ -0,0 +1,10 @@
+namespace Jugenddienst_Stunden.Interfaces;
+
+public interface IAppSettings {
+	string ApiUrl { get; set; }
+	string ApiKey { get; set; }
+
+	int EmployeeId { get; set; }
+	string Name { get; set; }
+	string Surname { get; set; }
+}