Frontend playbook

Pick the app first. Then use Screens / Pages (default), Logic / Functions (same write-ups, capability names), or ENV / Metadata Catalog.

App	Host	Audience	Start
User App	app*.nellalink.com	Logged-in owner (React)	Screens · Logic · ENV / Metadata Catalog
Front-facing	business*.nellalink.com/app/...	Guest, no login (React on faruq; Nuxt on master)	Screens · Logic · ENV / Metadata Catalog

They meet at QR/share (User App publishes the URL) and at checkout (Front-facing calls Middleware; owner sees the inbox).

Browse x-api-key is public. IDOR is Core Backend and Middleware Backend. Security.