v1.1.0 — Safe update notifications

Safe update notifications

• Adds an admin-only Settings → Updates page that compares the installed version with the latest QueueFix GitHub release.
• Adds GET /version, exposing only the installed application version for deployment checks.
• Update checks are cached for 12 hours and request public release metadata only; no ticket, mailbox, user, or account content is sent.

Safer upgrades

• Adds a tag-pinned Docker Compose updater that takes a PostgreSQL backup before code/dependency/migration changes.
• Adds explicit backup, rollback, and smoke-test documentation. The application never installs a release automatically.

Security

• Settings routes now enforce the intended administrator authorization boundary.

Verification

• CI passed on PostgreSQL and MySQL, plus static analysis and frontend checks.