Adopt a two-level ownership model: a customer owns many sites, with
isolation/containers/DB/backup at the site level and grouping (one SFTP
login, recursive backup, billing, bulk delete) at the customer level.
- 03-naming-conventions: rewritten for customer/site ids and slug =
<customer>-<site>; nested ZFS, per-customer SFTP chroot, deployments
mirror the nesting.
- Propagated paths through docs 01, 04, 05, 06, 07 and deployments/README.
- ADR 0005 retitled/updated to per-site datasets nested under customer.
- architecture-plan.md: note pointing to doc 03 as authoritative on naming.
Clarifies subdomains: same-app subdomains are aliases on one site; a
separate-app subdomain is its own isolated site under the same customer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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