Register AnnotationManager as transient service

Updated DI comment for clarity on service lifetimes and added AnnotationManager as a transient service to the dependency injection container.

EnvelopeGenerator.ServiceHost/Extensions/DependencyInjection.cs

@@ -21,7 +21,7 @@ public static class DependencyInjection
         services.AddSingleton<State>();
         services.AddScoped<MSSQLServer>();
 
-        //TODO: Check lifetime of services. They might be singeton.
+        //TODO: Check lifetime of services. They might be singleton or scoped.
         services.AddTransient<GdViewer>();
         // Add LicenseManager
         services.AddTransient(provider =>
@@ -31,6 +31,7 @@ public static class DependencyInjection
             licenseManager.RegisterKEY(options.GdPictureLicenseKey);
             return licenseManager;
         });
+        services.AddTransient<AnnotationManager>();
 
         return services;
     }