Ch service design: Improve connection of domain model and functional requirement chapter #8

Feedback from sessions in March 2026

Chapter: service design
Feedback: Add a sentence that FRs are already achieved by creating a domain model; Or remove this module --> same contents under Architecture 4 (for context: In the Architecture, it's written that we need functional requirements and NFRs. NFRs are named in this chapter, but the mentioning of FRs is missing for the homogenic structure