refac: DELETE /v1/user/{id}?expected_role_id=N, user.remove audit event, 409 target_role_not_found, GetAll returns its error, Own-scope visibility filter moved into repos, JSON tags removed from use-case types

internal/domain/user/userRepositoryInterface.go

@@ -10,6 +10,7 @@ type Repository interface {
 	FindByIDs(ids []uint32) ([]User, error)
 	Create(user User) (User, error)
 	Delete(id uint32) error
+	DeleteIfRole(id uint32, roleID uint32) error
 	UpdateVerificationStatus(userId uint32, isVerified bool) (User, error)
 	UpdatePassword(userId uint32, password string) (User, error)
 	UpdatePasswordResetCode(userId uint32, code string, expiration time.Time) (User, error)