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.GeneratorAPI/Program.cs

@@ -105,6 +105,7 @@ try
     });
     builder.Services.AddOpenApi();
 
+    // TODO: Update to configure with EnvelopeGenerator.DependencyInjection
     //AddEF Core dbcontext
     var useDbMigration = Environment.GetEnvironmentVariable("MIGRATION_TEST_MODE") == true.ToString() || config.GetValue<bool>("UseDbMigration");
     var cnnStrName = useDbMigration ? "DbMigrationTest" : "Default";