dev_id can null for internal towers

usecase/tower_usecase.go

@@ -45,10 +45,6 @@ func (u *towerUsecase) PostWithMultipleImages(tower req.TowerDTO, imageFiles []*
         return err
     }
 
-    // Validate that if it's not an external tower, DeviceID must be provided
-    if tower.ExternalTower != nil && !*tower.ExternalTower && tower.DeviceID == nil {
-        return fmt.Errorf("device_id is required for internal towers")
-    }
 
     // Validate that if DeviceID is provided, the device exists
     if tower.DeviceID != nil {