Teams admin: roster page + live team_id options

[hamin2006]

Context

Team assignment exists on applications (team_id), but the dropdown options are a static JSON snapshot of the teams table, and there is no roster/team-management admin surface anywhere.

Current behavior

• config.application.subfields[team_id].options on live forms contains stale team copies (and broken null/"TBD" pseudo-options). New teams never appear without raw SQL.
• Assignment UI: team_id column/dropdown in the reviewer table + popover (data-driven via subfield config).
• No admin page reads/writes teams/team_members; board lanes are status-only (board/page.tsx).
• Members API exposes team membership read-only (/portal/api/v1/members with team_members include); an external read route /api/v1/teams/forms/[id] exists with no admin counterpart.
• Team_id only becomes meaningful on offer acceptance (creates team_members rows), so mis-assigned teams linger.

Desired behavior

• Teams admin page: list teams, view rosters (members + roles), create/rename/archive teams.
• Sync options: team_id options derived from the teams table (server-side at load time) instead of the config snapshot; fall back for offline/legacy.
• Optionally: team filter chips on the table, team lanes on the board.

Acceptance criteria

• Admin can manage teams and see member rosters
• Reviewer team dropdown lists live teams (no SQL needed after team creation)
• Legacy config snapshots either migrate or are ignored in favor of the table
• Offer-acceptance flow still works with team assigned via the new options