v0.7.2

Archived leagues stay hidden; team season stats.

- A player's own league list (`/v1/users/me/leagues`) no longer includes archived leagues, and their team list (`/v1/players/me/league-teams`) no longer includes teams in archived seasons — archiving only ever set `archived_at`, and these lists filtered on status. Fixes archived leagues and seasons showing in the sidebar switcher, Find a team, and My Teams. Restore brings them back.
- New `GET /v1/league-team-seasons/{id}/stats`: the roster's median / total / max CS2 Premier rating and the team's past games this season and all-time, for the team detail page.

Pull requests: https://github.com/mtottenh/cg/pull/14, https://github.com/mtottenh/cg/pull/15