refactor(di): unify Application and Infrastructure DI registrations under a central method

- Added central AddEnvelopeGenerator extension to aggregate existing DI setups
- Introduced EGConfiguration for modular service registration
- Standardized configuration pattern for Application and Infrastructure layers
- Simplified distributed cache and localization registration

EnvelopeGenerator.GeneratorAPI/Program.cs

@@ -185,7 +185,7 @@ try
     // Envelope generator serives
 #pragma warning disable CS0618 // Type or member is obsolete
     builder.Services
-        .AddEnvelopeGeneratorInfrastructureServices(opt =>
+        .AddEGInfrastructureServices(opt =>
         {
             opt.AddDbTriggerParams(config);
             opt.AddDbContext((provider, options) =>