feat: complete the group model (god_admin, site groups, aggregates), enforce naming, fix docs 500s + status dots (v1.26.0)

- seed god_admin + nest into app_super_admin; auto-provision site groups (S_super_admin, S_hosts_*/S_apps_* aggregates, S_everyone) on site create + self-heal on Directory load
- map service resources to the app kind (site_local_app_<slug>_*); nest per-resource groups into site aggregates (physical inheritance lattice)
- enforce the group naming convention server-side on POST /groups; surface god_admin + site groups on the site resource modal
- fix in-app /docs/<slug> 500s (Dockerfile never copied docs/); serve doc images at /docs/images
- fix Directory status dots (neutral grey when agent endpoint unreachable); align Profile/API cards full-width
- group resolver: keep the site slug verbatim (site_local not re-slugified)
- bump to 1.26.0

.dockerignore

@@ -19,6 +19,9 @@
 !API.md
 !directory_spec.md
 !docs/**/*.md
+# The screenshots the README (served at /docs/overview) links. `COPY docs /docs`
+# in Dockerfile.openldap needs these present in the build context.
+!docs/images/**
 
 # Tests (excluded from production builds; test-runner Dockerfile copies them explicitly)
 # nodejs/tests/