refactor: re-export ownership utilities from player-manager

Add convenience re-exports of player ownership utilities to player-manager.
This makes ownership functions easily accessible alongside other player
management functions.

Part of player ownership centralization plan (Phase 3/7).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/lib/arcade/player-manager.ts

@@ -7,6 +7,9 @@ import { and, eq } from 'drizzle-orm'
 import { db, schema } from '@/db'
 import type { Player } from '@/db/schema/players'
 
+// Re-export ownership utilities for convenience
+export { buildPlayerOwnershipMap, type PlayerOwnershipMap } from './player-ownership'
+
 /**
  * Get all players for a user (regardless of isActive status)
  * @param viewerId - The guestId from the cookie (same as what getViewerId() returns)