`/admin` was 404 — only `/admin/team` existed. Add a browseable index so
the admin area has a root, with the existing Team-Verwaltung tile alongside
greyed-out roadmap placeholders (Departments, Audit-Log, Email-Templates,
Feature-Flags) so admins see what's coming.
- internal/handlers/admin_users.go: handleAdminIndexPage serves
dist/admin.html. Same RequireAdminFunc gate as /admin/team — non-admins
get the standard 302 to /dashboard?forbidden=admin.
- internal/handlers/handlers.go: register GET /admin under the existing
admin-conditional block.
- frontend/src/admin.tsx + client/admin.ts: card grid built from the
shared .grid + .card landing-page pattern. .admin-card-soon dims the
placeholders + adds a "Kommt bald" badge so they read as roadmap, not
broken links.
- frontend/src/components/Sidebar.tsx: add Admin-Bereich (/admin) above
Team-Verwaltung in the existing admin group. Both items live in the
same display:none group that sidebar.ts reveals after /api/me confirms
global_role='global_admin'.
- frontend/src/client/i18n.ts: nav.admin.bereich + admin.title /
.heading / .subtitle / .section.{available,planned} / .coming_soon
plus per-card title+desc, DE+EN.
- frontend/src/styles/global.css: .admin-section-planned spacing,
.admin-card-soon dimming, .admin-soon-badge pill.
- frontend/build.ts: register the renderAdmin entrypoint and admin.ts
client bundle.
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