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
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