fix(ERP-247): add warning logs for null subsidy/partner_warehouse_id, restore deliver...

fix(ERP-247): add warning logs for null subsidy/partner_warehouse_id, restore delivery info as Yii::info

- Extract getSubsidy() and getPartnerWarehouseId() to local vars in all 6 item-saving blocks
- Log Yii::warning with orderId + shopSku when either returns null
- Restore срок доставки shipments loop (was removed as debug, actually informational)
- Change level from Yii::error to Yii::info for shipment delivery time logging

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>