- Remove id field from ProductSupplierResponse
- Rename supplierPrice to cost in ProductSupplierResponse and ProductSupplierRequest
- Update ProductSupplierApi to use composite keys (productId, supplierId) for update and delete
- Update ProductSupplierController delete logic to iterate and delete with composite keys
- Update ProductSupplierController mapping to use getCost() instead of getSupplierPrice()
- Update ProductSupplierDialogController to pass both productId and supplierId to update
- Update ProductSupplierDialogController to use setCost() instead of setSupplierPrice()
- Remove unused selectedId field from ProductSupplierDialogController
