Module backend

Backend contracts domain public surface.

Responsibility:

• Contract-first HTTP API surface: route contracts + DTO payload types.
• Shared types required to reason about requests/responses.

Non-responsibilities:

• Express router wiring.
• Controller/service implementation.
• Database models/entities.

Start here:

• RouteContract
• AuthRoutesContract

Notes:

• Treat contracts as versioned/stable; changes are breaking.
• DTOs are boundary shapes (do not rely on internal server types).