Discovery Merchant Portal

Next.js + shared contracts + Nest-style API scaffold

This foundation introduces the new merchant portal packages inside the existing repository, keeping the Expo app intact while adding a web portal, API surface, and shared discovery contracts that the RN app can adopt later.

Open Login Open Merchant Shell

Merchants in demo state

Brands modelled

Published discovery offers

Implemented slices

Shared enums, types, parsers, upload helpers, and discovery mappers in `packages/discovery-shared`.
Auth/session, onboarding, brand preview, promotion review, and discovery feed endpoints in `apps/discovery-portal-api`.
Login/no-access, dashboard, onboarding, brand management, and promotion pages in `apps/discovery-portal-web`.