feat: TypeORM repository skill (pure persistence port)

[joao-oliveira-softtor]

Track

Persistence & adapters — see ROADMAP.md

Goal

Add a skill (or infrastructure reference) for TypeORM repositories that implement the same pure-persistence port shape as Prisma:

• toEntity() / toModel() mapper
• in-memory twin for unit tests
• no event dispatch in the repository

Acceptance

• Port stays in domain/application; adapter in infrastructure
• Reference doc under skills/infrastructure/references/ or new skill
• Example snippet + TDD test outline
• README/ROADMAP updated

Why

Many NestJS teams use TypeORM; Prisma-only examples block adoption.