cfe12e4dd0
- Added `Tagesabschluss` entity and repository to handle daily cash closing logic. - Introduced cancellation logic for `Buchung`, enabling creation of offsetting entries. - Extended schema definitions with `TagesabschlussTable` and nullable `storniertBuchungId` in `BuchungTable`. - Updated services to support `Tagesabschluss` creation and `Buchung` cancellation. - Implemented tests for `TagesabschlussService` and cancellation functionality. - Updated documentation to reflect completed roadmap items related to cash management.