Portal backend

[jbrunton96]

Description of Changes

---

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

Documentation

• I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
• I have read the section Add New Translation Tags (for new translation tags only)

Translations (if applicable)

• I ran scripts/counter_translation.py

UI Changes (if applicable)

• Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR)

Testing (if applicable)

• I have run task check to verify linters, typechecks, and tests pass
• I have tested my changes locally. Refer to the Testing Guide for more details.

[stirlingbot]

✅ Backend License Check Passed

All backend dependencies have valid and allowed licenses.

The backend license report has been updated successfully.

[stirlingbot]

🚀 V2 Auto-Deployment Complete!

Your V2 PR with embedded architecture has been deployed!

🔗 Direct Test URL (non-SSL) http://54.175.155.236:6710

🔐 Secure HTTPS URL: https://6710.ssl.stirlingpdf.cloud

This deployment will be automatically cleaned up when the PR is closed.

🔄 Auto-deployed for approved V2 contributors.

[github-actions]

📦 Tauri Desktop Builds Ready!

The desktop applications have been built and are ready for testing.

Download Artifacts:

🐧 Linux x64: Download Stirling-PDF-linux-x86_64 (.deb, .rpm, .AppImage) - 830.8 MB
🍎 macOS Universal: Download Stirling-PDF-macos-universal (.dmg) - 319.1 MB
🪟 Windows x64: Download Stirling-PDF-windows-x86_64 (.exe, .msi) - 249.2 MB

---

Built from commit f4857c0
Artifacts expire in 7 days