Merge branch 'promos' into 'main'

...ma/migrations/20231210131054_add_promotions/migration.sql

packages/api/prisma/schema.prisma

packages/api/scripts/generate-promo-code.ts

packages/api/src/objects/events.ts

packages/api/src/objects/promotions.ts

packages/api/src/objects/registrations.ts

packages/api/src/objects/tickets.ts

packages/api/src/schema.ts

packages/app/src/lib/components/NavigationTop.svelte

packages/app/src/lib/components/OverlayQuickBookings.svelte

packages/app/src/lib/session.ts

packages/app/src/routes/bookings/[pseudoID]/+page.server.ts

packages/app/src/routes/bookings/[pseudoID]/+page.svelte

packages/app/src/routes/claim-code/+page.svelte

packages/app/src/routes/claim-code/+page.ts

packages/app/src/routes/claim-code/[code]/+page.svelte

packages/app/src/routes/claim-code/[code]/+page.ts

packages/app/src/routes/events/[group]/[uid]/+page.svelte

packages/app/src/routes/events/[group]/[uid]/+page.ts

packages/app/src/routes/login/+page.svelte