New TurnKey Observium version (19.0)

Changes:

• Install the official Observium CE 26.1.14545 archive with a pinned SHA-256 digest.
• Update the appliance for Debian 13/Trixie and PHP 8.4.
• Modernize firstboot password hashing and keep generated credentials out of process arguments and build tracing.
• Add a noninteractive Community Edition update check and apply command.

Links

• Release meta-files (signature, manifest)