Build an Orders API in NestJS: Nested Prisma Writes and Server-Side Totals E-10

A store is not a store until someone can buy something. This episode builds orders, and it puts the money math where it belongs: on the server.

We migrate the Order and OrderItem models, build CreateOrderDto with nested validation, and write an OrdersService that computes totals server-side inside a single Prisma nested write, so an order and its items are created atomically. Ownership-checked reads round it out, all behind auth-guarded routes.

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