v0.2.4 Release Display Fix

v0.2.4 fixes the release shown in the System status area.

Included

• Backend setup status now reports the release from shared build metadata instead of an old hardcoded value.
• The UI header now uses the backend setup-status release, so the header and System status display the same version.
• A regression test compares setup status to the repository VERSION file.

Operator Notes

After updating the LXC, both the top header and System status should report v0.2.4.

Verification

• npm run frontend:check
• npm run build
• Docker Go tests: go test ./...