Inject an application-generated Prisma v7 client. This is required for the Prisma adapter because generated-client output belongs to the application rather than this package — see PrismaAdapterOptions, which makes that a compile error rather than a startup throw.

A Prisma 7 client needs a driver adapter of its own (new PrismaClient({ adapter: new PrismaPg({ connectionString }) })); the engine-bundled new PrismaClient() constructor was removed in v7.