refactor: inject IScheduler via DI instead of using StdSchedulerFactory directly

EnvelopeGenerator.Finalizer/Program.cs

@@ -72,6 +72,10 @@ try
     });
 
     builder.Services.AddQuartzmon();
+
+    builder.Services.AddSingleton(provider =>
+        provider.GetRequiredService<ISchedulerFactory>().GetScheduler().Result
+    );
     #endregion
 
     #region Add DB Context, EG Inf. and Services
@@ -132,7 +136,7 @@ try
 
     app.UseQuartzmon(new QuartzmonOptions()
     {
-        Scheduler = StdSchedulerFactory.GetDefaultScheduler().Result,
+        Scheduler = app.Services.GetRequiredService<IScheduler>(),
         VirtualPathRoot = "/quartz"
     });