refactor(Finalizer.Program): simplify EnvelopeGenerator service registration using AddEnvelopeGenerator extension

- Replaced manual service setup with AddEnvelopeGenerator fluent configuration
- Added EnvelopeGenerator.DependencyInjection namespace
- Integrated distributed SQL Server cache for EG services
- Improved DI structure and reduced obsolete warnings

EnvelopeGenerator.DependencyInjection/DependencyInjection.cs

@@ -38,6 +38,7 @@ public static class DependencyInjection
                 _serviceRegs.Dequeue().Invoke(services);
         }
 
+        // TODO: update to use attributes and reflections instead of _addingStatus-dictionary
         private readonly Dictionary<string, bool> _addingStatus = new ()
         {
             { nameof(AddLocalization), false },