refactor(api): move DeletingRandomAccessFile to CustomPDFDocumentFactory as a private static class

[balazs-szucs]

Description of Changes

It was in a seperate dir (app/common/src/main/java/org/apache/pdfbox/examples/util/) which i felt out of place for it.

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Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• I have read the How to add new languages to Stirling-PDF (if applicable)
• I have performed a self-review of my own code
• My changes generate no new warnings

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• I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
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[Copilot]

Pull request overview

This PR refactors PDFBox temp-file handling by relocating DeletingRandomAccessFile from an org.apache.pdfbox.examples.*-namespaced utility into CustomPDFDocumentFactory, making it a private implementation detail where it’s actually used.

Changes:

• Removed the external org.apache.pdfbox.examples.util.DeletingRandomAccessFile class and its import.
• Added DeletingRandomAccessFile as a private static nested class within CustomPDFDocumentFactory to keep temp-file lifecycle logic co-located with the factory.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/common/src/main/java/stirling/software/common/service/CustomPDFDocumentFactory.java	Removes the external import and inlines DeletingRandomAccessFile as a private nested implementation used by the factory.
app/common/src/main/java/org/apache/pdfbox/examples/util/DeletingRandomAccessFile.java	Deletes the now-unneeded standalone utility class previously living under an org.apache.pdfbox.examples.* path.

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