fix(refs): resolve logical group statuses

[bwl21]

Summary

• load the group-status catalog from /person/masterdata and resolve technical status names to host-local IDs
• reverse-resolve known groupStatusId values during adoption while preserving unknown numeric IDs with an actionable portability warning
• keep existing numeric input backward compatible and distinguish group statuses from membership and person statuses in documentation and code comments
• cover hosts that assign different numeric IDs to the same technical status name

Testing

• npm run test — 1,083 passed, 5 skipped
• npm run typecheck
• npm run lint
• npm run format:check
• npm run build
• node .github/scripts/docs-staleness.mjs
• mkdocs build -f docs/handbuch/mkdocs.yml --strict

Closes #157