add getPlayerDisplayNames to RoomManager

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/server/src/rooms/room-manager.ts

@@ -154,6 +154,16 @@ export class RoomManager {
 		return Array.from(room.players.values()).map((p) => p.id)
 	}
 
+	getPlayerDisplayNames(code: string): Record<string, string> {
+		const room = this.rooms.get(code)
+		if (!room) return {}
+		const result: Record<string, string> = {}
+		for (const player of room.players.values()) {
+			result[player.id] = player.displayName
+		}
+		return result
+	}
+
 	getPlayerIdBySession(code: string, sessionId: string): string | null {
 		const room = this.rooms.get(code)
 		if (!room) return null