Refactor Api-Client

Add Exceptionhandler, AlertService JSON-Converter
AppSettings via DI

Reformat Code

Jugenddienst Stunden/Infrastructure/ApiOptions.cs

@@ -0,0 +1,6 @@
+namespace Jugenddienst_Stunden.Infrastructure;
+
+internal sealed class ApiOptions {
+	public required string BaseUrl { get; init; }
+	public TimeSpan Timeout { get; init; } = TimeSpan.FromSeconds(15);
+}