feat: add invoice-config-items management functionality

internal/models/responses/invoice_config_item_response.go

@@ -0,0 +1,15 @@
+package responses
+
+type CreateInvoiceConfigItemResponse struct {
+	ID int64 `json:"id"`
+}
+
+type UpdateInvoiceConfigItemResponse struct {
+	ID               int64  `json:"id"`
+	InvoiceConfigID  int64  `json:"invoiceConfigId"`
+	ComponentID      int64  `json:"componentId"`
+	RequiredQuantity int32  `json:"requiredQuantity"`
+	AllowAlternative bool   `json:"allowAlternative"`
+	PriorityOrder    int32  `json:"priorityOrder"`
+	Note             string `json:"note"`
+}