Leopoldadmin 2cf433a01c feat(T04): contact management + USt-IdNr. validation + contact UI ...

- Contact model: company, role (kaeufer/verkaeufer/beide), soft-delete
- ContactPerson model: 1:N relation with CASCADE delete
- USt-IdNr. validation: DE + 10 EU countries
- Contact CRUD: 7 API endpoints with RBAC, search/filter/paginate
- Frontend: ContactList, ContactForm, ContactDetail with EU/Inland toggle
- 73 backend tests (91% coverage), 20 frontend tests

2026-07-14 12:14:21 +02:00

52 KiB

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