Imports QuickBooks invoices into Alga with optional upsert behavior. Both /api/v1/integrations/quickbooks/* and /api/v1/quickbooks/* map to the same ApiQuickBooksController method (importInvoices). This family is a path alias that binds controller methods directly (for example `export const GET = controller.getAccounts()`) and relies on controller-level error handling.
Content type: application/json · schema QuickBooksV1InvoiceImportBody
Success response 200 · schema QuickBooksV1ApiSuccess