Document validation update guidelines for ThirdParty entity to align with associated Vue component logic.

- Added documentation to ensure updates in validations reflect in `ThirdPartyEdit.vue` and violation lists for consistency.
- Clarified the relationship between validation logic and UI component updates.

src/Bundle/ChillThirdPartyBundle/Entity/ThirdParty.php

@@ -69,6 +69,11 @@ use Symfony\Component\Validator\Constraints as Assert;
  *
  * The difference between categories and types is transparent for user: they choose the same fields into the UI, without
  * noticing a difference.
+ *
+ * ## Validation
+ *
+ * When a validation is inserted / updated, do not forget to update the related ThirdPartyEdit.vue component and the associated
+ * list of possible violations.
  */
 #[ORM\Entity]
 #[ORM\Table(name: 'chill_3party.third_party')]