feat(db): add lobbies and lobby_players tables + model

- Add lobbies and lobby_players tables with camelCase TS aliases
- Add LOBBY_STATUSES constant in shared
- Add lobbyModel with atomic addPlayer and transactional finishGame
- Enable Drizzle relational query API via { schema } option

packages/shared/src/index.ts

@@ -1,2 +1,3 @@
 export * from "./constants.js";
 export * from "./schemas/game.js";
+export * from "./schemas/lobby.js";