Changed ASP.NET Core log level to Information in development.
Added Worker.InitialJobState setting to control job startup state,
defaulting FinalizeDocumentJob to Running. Added explanatory
comments for job state values.
Created a new EnvelopeGenerator.ServiceHost project targeting .NET 8.0. Set up minimal API host with controllers, Swagger/OpenAPI support, and development configuration files. Updated solution to include the new project with appropriate build settings.
