Add i18n factory + AdminShell My Profile + LogoutButton anchor

- src/i18n/server.ts: createI18nConfig factory consolidating the locale
  resolution chain (cookie → access_token preferred_language claim →
  Accept-Language → default). Reusable across apps; previously each
  frontend reimplemented it.
- AdminShell: thread signoutPath + myProfileUrl (default
  https://my.gosec.internal/profile) into the navbar; render My Profile
  link alongside logout.
- LogoutButton: replace two-step fetch+signOut+redirect with a plain
  anchor pointing at signoutPath — the NextAuth POST-only signout
  endpoint plus form-CSRF flow doesn't need client JS.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/forms/index.ts

@@ -59,7 +59,6 @@ export {
   useValidation,
   useFieldValidation,
   useAddressAutocomplete,
-  loadGoogleMapsScript,
 } from "@limitless/ui";
 
 // Validation — format validators