Adds /team page that lists every onboarded Paliad user, grouped by office
(default) or by department, with a free-text search and per-office filter
pills. Each card shows display name, role, primary office (with any
additional offices), department tag, and a mailto: link.
Backend:
- /api/users now also returns additional_offices (column was already on the
model + DB; just missing from the SELECT list).
- /api/departments?include=members returns each department enriched with
its lead user snapshot and the full member list — single fetch for the
"by department" grouping.
- New page handler /team behind the onboarding gate.
Frontend:
- frontend/src/team.tsx + frontend/src/client/team.ts (new) for the page
shell and client-side rendering / filtering.
- New "Team" entry in the Übersicht sidebar group with a users icon.
- DE/EN i18n keys (nav.team, team.*).
- Team-specific CSS for cards, group headers, avatars, and badges.
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