feat: Fedex import flow, orders + invoice APIs, payment bundles
- /fedex: batch create, document upload/replace/delete, save shipment, imported list
- /api/orders, /api/invoices, /api/pb-file, /api/pb/refresh-token, /api/stock-codes
- /api/payments/bundle: generate + download-all remittance bundles
- shared app/components/DocCell.tsx and app/lib/{invoice-docs,pb-fetch,pb-token}.ts
- recon: invoice reconciliation reports and PowerShell fix-plan scripts
- .gitignore: exclude one-off scripts/_* debugging artefacts, recon/pdfs+txts, data backups
5f73d2ea71