Add Help/About, issue reporting, and Zenodo DOI sync

[SebRoLENS]

In-app support and acknowledgements

• Add a bilingual Help menu with Report a problem and About PACE Controller.
• Link reports directly to the public GitHub issue tracker.
• Show Sebastiano Romi, European Laboratory for Non-Linear Spectroscopy (LENS), University of Florence (UNIFI), and romi@lens.unifi.it in the application.
• Reuse CurveMole's cleaned Linux host environment so packaged applications can open browser and file-manager links reliably.
• Add a structured GitHub bug-report form.

Zenodo DOI automation

• Dispatch an asynchronous DOI-sync workflow after every GitHub release.
• Poll Zenodo for the matching title and version.
• Insert the version DOI automatically into the README badge/citation, CITATION.cff, and GitHub release notes.
• Reset future releases to a DOI-pending state until archival completes.
• Add full author affiliation and institutional email to citation/package metadata.

Documentation and validation

• Document the Help menu, author contact, issue reporting, and DOI lifecycle.
• 17 passed in the cross-platform pytest suite.
• All 7 repository consistency tests passed.
• Release scripts and Python sources compile cleanly.
• git diff --check passes.
• The frozen v0.3.1 PowerShell implementation remains unchanged.

One-time prerequisite: enable SebRoLENS/pace-controller in the Zenodo GitHub integration. The workflow itself needs no Zenodo token.