Add unit tests for Fuchs_DataService and related components

- Introduced comprehensive unit tests for the Fuchs_DataService library, covering DATEV header formatting, CSV/XML generation, and FdsMfrClient construction.
- Implemented tests for FdsMfr.UpdateNeed parsing and FdsShared utility helpers, ensuring correct functionality and stability.
- Added tests for FdsConfig and FdsMfrClient to validate configuration resolution and client construction.

Document decisions on backend-authoritative invoice and reminder handling

- Created ADR 0008 to clarify that all invoice types and reminder stages are backend-authoritative during drafting and previewing.
- Established that all calculations and settings must be processed server-side, ensuring consistency between online editor and PDF outputs.

Define irreversible mutations for set-price modes in invoices

- Documented ADR 0009 to specify that the "Set mit Preis" and "Nur Set mit Preis" operations are irreversible mutations affecting service request blocks.
- Clarified that these operations are not display toggles but actual data changes, ensuring clear expectations for invoice handling.

Transition MFR ERP sync to in-process execution within the web app

- Created ADR 0010 to outline the migration of Fuchs_DataService from a standalone service to an in-process library within the Fuchs web application.
- Updated configuration and logging management to be handled by the host application, streamlining the sync process.

Add publish profile and periodic hosted service for job scheduling

- Introduced a publish profile for deployment to a specified folder.
- Implemented PeriodicHostedService to manage multiple independent jobs, including the MFR ERP sync, with configurable execution intervals.

Add dotnet-tools.json for EF Core CLI tools

- Included dotnet-tools.json to manage the version of dotnet-ef for Entity Framework Core migrations and commands.

Fuchs/js/intranet/modules/fis.req_txt_de.js

@@ -36,6 +36,7 @@
     combP: 'Positionen zusammenfassen',
     toSetP: 'Auf Setpreis umstellen (Positionen ohne Preis)',
     toSetPc: 'Der Set-Preis wird auf die Summe seiner Positionen gesetzt und die Positionen selbst verlieren ihren Preis. Das ist nicht rückgängig zu machen (der Betrag kann danach nur noch manuell geändert werden). Fortfahren?',
+    toSetMc: 'Jeder Leistungsauftrag wird zu einer Set-Position mit der Summe als Preis zusammengefasst. Das ist nicht rückgängig zu machen (die Set-Preise können danach nur noch manuell geändert werden). Fortfahren?',
     iSum: 'Zwischensumme',
     dtRel: 'Freigegeben am: ',
     dtCr: 'Erstellt am: ',