Extend nomarchy.services.* with three more opt-in toggles:
- podman: rootless containers, `docker` aliased to it, container DNS, and a
subuid/subgid range for the login user.
- flatpak: services.flatpak + a oneshot that adds the Flathub remote
system-wide (idempotent, retries when online).
- pika: ships pika-backup, the GUI for scheduled Borg backups.
Commented examples in the downstream system.nix template, per convention.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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