feat(typeorm): support selected CRUD records

[kauandotnet]

Summary

• add opt-in TypeORM-native selected record hydration with inferred narrow response types
• use explicit selected reads and narrow PostgreSQL RETURNING for mutations without hidden full-row reloads
• reauthorize update/delete DML, fail closed on unsafe metadata and parameter collisions, and document query-builder lifecycle semantics

Verification

• PG_URL=postgresql://nestm:nestm@localhost:55435/nestm_crud pnpm run verify
• independent type, runtime, DML, and API review completed with no release blockers