fix(knowledge): use EntityNotFoundError/DuplicateEntityError instead of DomainError(status_code=)

backend/app/services/lesson_learned_service.py

@@ -6,7 +6,7 @@ from uuid import UUID
 
 from sqlalchemy.orm import Session
 
-from app.domain.errors import DomainError
+from app.domain.errors import EntityNotFoundError
 from app.models.knowledge import LessonLearned
 
 
@@ -16,7 +16,7 @@ def _get_or_404(db: Session, ll_id: UUID) -> LessonLearned:
         LessonLearned.is_active == True,
     ).first()
     if not ll:
-        raise DomainError(f"Lesson Learned {ll_id} not found", status_code=404)
+        raise EntityNotFoundError("LessonLearned", str(ll_id))
     return ll