* feat: add About section with version info and update check
- Add About menu item in user dropdown
- Show frontend and backend versions separately
- Add 'Check for Updates' feature using GitHub API
- Compare versions using semver logic
- Cache update check results in sessionStorage (1 hour TTL)
- Link to GitHub repository
- Add i18n translations for EN and DE
- Extend health endpoint to return backend version
* fix: correct i18n interpolation in About modal
- Fix copyright year using dynamic interpolation
- Fix update available message (remove duplicate version placeholder)
- Add download link for available updates
- Change license to GPL-3.0
* fix: correct license to MIT
* chore: sync package.json versions to v1.3.1
Daniel Volz
1920b47924