Add InitialJobState and GdPictureLicenseKey to WorkerOptions

Added InitialJobState as a Dictionary<string, State> with an empty default, and introduced a non-nullable GdPictureLicenseKey property to the WorkerOptions class. These additions support initial job state configuration and GdPicture licensing.

EnvelopeGenerator.ServiceHost/Jobs/WorkerOptions.cs

@@ -16,6 +16,8 @@ public class WorkerOptions
         }
     }
 
+    public Dictionary<string, State> InitialJobState { get; set; } = [];
+
     public string GdPictureLicenseKey { get; set; } = null!;
 
     public PDFBurnerOptions PdfBurner { get; set; } = new();