Major refactor replacing Sale/Order with ShopPO → Invoice → LoadingSheet flow. Removed legacy Sale/Order models and features; introduced ShopPO, ShopPOItem, Invoice, LoadingSheetOrder, and SysConfig models. Updated related entities, enums, repositories, and controllers. Added new migrations for schema changes and system config. Overhauled business logic and DI registrations. Updated documentation with migration plan.
Updated documentation to clarify and redesign dispatch pipeline, loading event, and order/invoice lifecycle. Added PO cancellation flow for both Shop and Confirmed POs, introduced new API endpoint for cancellation, and simplified loading sheet model and endpoints. Added new permissions for loading operations, improved auditability, and detailed migration steps. Highlighted open questions on cancellation cascades, permissions, and vehicle capacity checks for future resolution.