عرض عملي: ترحيل الكتالوج إلى Spring Data JPA

خطوة بخطوة

1. Keep the ProductRepository contract the service uses; add JPA entities from JNR-028.
2. Create ProductJpaRepository extends JpaRepository and adapt the existing implementation to call it.
3. Add findBySku and a name search with @Query.
4. Planned mistake: write a 60-character derived method name; show it, then replace it with @Query.
5. Run the API tests; the contract is unchanged.
6. Remove the old Spring JDBC code once tests pass.