Refactor Api-Client

Add Exceptionhandler, AlertService JSON-Converter
AppSettings via DI

Reformat Code

Jugenddienst Stunden/Infrastructure/SettingsTokenProvider.cs

@@ -0,0 +1,10 @@
+using Jugenddienst_Stunden.Interfaces;
+
+namespace Jugenddienst_Stunden.Infrastructure;
+
+internal sealed class SettingsTokenProvider : ITokenProvider {
+	private readonly IAppSettings _settings;
+	public SettingsTokenProvider(IAppSettings settings) => _settings = settings;
+
+	public string GetToken() => _settings.ApiKey;
+}