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.
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