Rename DefaultApplicationName to ApplicationName

Updated the `Pkcs11Options` class to rename the `DefaultApplicationName` property to `ApplicationName`, clarifying its role as a globally controlled value embedded in PDF signature metadata.

Modified `PdfDigitalSignatureService` to source `ApplicationName` directly from `Pkcs11Options`, removing client-level overrides. Updated `PdfSignatureController` to reflect this change by removing the `ApplicationName` property from `SignOptions`.

Updated `appsettings.json` and `README.md` to reflect the property name change. These changes enforce stricter configuration control, improving metadata consistency and security.

EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfSignatureController.cs

@@ -19,7 +19,6 @@ public class PdfSignatureController(IPdfDigitalSignatureService signatureService
         public string? Location { get; set; }
         public string? ContactInfo { get; set; }
         public DateTimeOffset? SigningTime { get; set; }
-        public string? ApplicationName { get; set; }
     }
 
     public sealed class CheckPdfSignatureForm
@@ -56,7 +55,6 @@ public class PdfSignatureController(IPdfDigitalSignatureService signatureService
             Location = request.Location,
             ContactInfo = request.ContactInfo,
             SigningTime = request.SigningTime,
-            ApplicationName = request.ApplicationName,
             CertificationLevel = PdfSignatureCertificationLevel.FormFillingAndAnnotations
         };
 
@@ -106,7 +104,6 @@ public class PdfSignatureController(IPdfDigitalSignatureService signatureService
             Reason = "reason",
             Location = "location",
             ContactInfo = "test@example.com",
-            ApplicationName = "signFLOW",
             CertificationLevel = PdfSignatureCertificationLevel.FormFillingAndAnnotations
         };
 

EnvelopeGenerator.Server/EnvelopeGenerator.Server/appsettings.json

@@ -65,7 +65,7 @@
       "PrivateKeyLabel": "company-sign-key-v1",
       "CertificateLabel": "company-sign-cert-v1",
       "DefaultReason": null,
-      "DefaultApplicationName": "signFLOW",
+      "ApplicationName": "signFLOW",
       "UseUtcSigningTime": true,
       "DefaultCertificationLevel": "NoCertification"
     }