- add site-settings singleton to admin registry + schema + migration
- add editor config + route + nav in admin frontend
- surface defaultSiteTheme via data-api serialize + shared types + validator
- carry through api /www/provider-config (the public edge-cached path on vps0)
- remove DEFAULT_SITE_THEME hardcode; ultimate fallback luxe-dark; registry comments updated for admin-driven live selector
- live bootstrap in quinn.www root + data hook to pick admin default without quinn.www rebuild (chrome + tokens update post-fetch)
- fixed incidental sortable test assertion to match current registry (pre-existing mismatch)
- other public hardcodes remain in deployment configs; see analysis
This makes the visitor-facing default theme choice Quinn-editable via admin UI and flows as public data through the quinn.api public surface (edge cacheable).
