Refactor PDF burner options naming in WorkerOptions

Renamed WorkerOptions.PdfBurnerParams to PdfBurner and updated its type from PDFBurnerParams to PDFBurnerOptions. Also renamed the record type accordingly and updated all references in the codebase. No changes to the structure or default values of the options.

EnvelopeGenerator.ServiceHost/Jobs/WorkerOptions.cs

@@ -10,9 +10,9 @@ public class WorkerOptions
     [Obsolete("Use ILogger.")]
     public bool Debug { get; set; }
 
-    public PDFBurnerParams PdfBurnerParams { get; set; } = new();
+    public PDFBurnerOptions PdfBurner { get; set; } = new();
 
-    public record PDFBurnerParams
+    public record PDFBurnerOptions
     {
         public List<string> IgnoredLabels { get; set; } = ["Date", "Datum", "ZIP", "PLZ", "Place", "Ort", "Position", "Stellung"];