New TurnKey osCommerce version (19.0)

Changes:

• Install osCommerce 4.14.63493 from a pinned and SHA-256 verified official GitHub source archive.
• Restore the catalog, administrator and product management flow on Debian 13 Trixie with PHP 8.4 and MariaDB 11.8.
• Retain the built-in App Shop System update path for application updates.
• Add focused v19 acceptance coverage and testing documentation.

Links

• Release meta-files (signature, manifest)