Send creation options as the nested options object the lobby expects,
drive the creation form from each game's options_schema, and render
history/leaderboard from the generic result payload (nullable teams,
float points). The lobby uses the payload's seats_open, and the
scopone-specific table, hand-end and game-over views are gated on its
game_type with an unsupported-game fallback for future games. The
websocket protocol is unchanged.