feat(AuthTokenKeys): Erstellt, um Parameter für Authentifizierungs-Tokens zu konfigurieren.

- AuthTokenKeys aus der Konfiguration in Program.cs lesen.
 - Upgrade von Core.Abstractions auf 3.5

EnvelopeGenerator.GeneratorAPI/Program.cs

@@ -11,6 +11,7 @@ using DigitalData.UserManager.DependencyInjection;
 using EnvelopeGenerator.Application;
 using DigitalData.Auth.Client;
 using DigitalData.Core.Abstractions;
+using EnvelopeGenerator.GeneratorAPI.Models;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -90,6 +91,8 @@ builder.Services.AddDbContext<EGDbContext>(options => options.UseSqlServer(connS
 
 builder.Services.AddAuthHubClient(config.GetSection("AuthClientParams"));
 
+var authTokenKeys = config.GetOrDefault<AuthTokenKeys>();
+
 // Authentication
 builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
 .AddCookie(options =>