52ccd7ad91
Site now embeds SiteConfig (22 persistent fields) and SiteState (11 ephemeral runtime fields). Field access unchanged via promotion — site.Name and site.Status still work. Store layer deals exclusively in SiteConfig — the DB never sees runtime state. Engine's liveState keeps full Site composites. UpdateSiteConfig reduced from 11-line field-by-field copy to `existing.SiteConfig = cfg`. RunCheck takes SiteConfig (only needs config fields). Checker is now statically prevented from reading/writing runtime state. Backup.Sites changed to []SiteConfig — exports no longer carry zero-valued runtime fields. Import backward-compatible (json ignores unknown fields).