Settings sub-nav: API and all config under one Settings surface
The admin sidebar used to expose **API** as its own top-level entry alongside Feedback, Roadmap, etc. Configuration was split across two surfaces (top-level "API" + a separate "Settings" page that only had General).
Now the project sidebar focuses on day-to-day work and **every configuration destination lives under Settings** with a shared left-rail nav: General, Privacy & Access, Login & SSO, Domain, Widget, Changelog, Integrations, **API**, Members, Billing, Data, Help. The Settings sidebar item stays active for any nested route.
- New shared `settings/layout.tsx` wraps every settings sub-page with the rail
- `SettingsNav` highlights the active page (with prefix-match for `/api-keys/*` etc.)
- Removed the standalone "API" item from the admin sidebar
You only have to learn the word "Settings" once.