fix(多人游戏): 修复多人游戏启动权限问题

将startMultiplayerGame的RPC权限从"authority"改为"any_peer"，并添加本地调用
确保所有客户端都能正确触发游戏开始

scripts/Contents/Panels/Starter.gd

@@ -51,7 +51,7 @@ func rebuildAllPlayers(playerNames: Array[String]):
 		i.queue_free()
 	for i in playerNames:
 		addPlayerName(i)
-@rpc("authority")
+@rpc("any_peer")
 func startMultiplayerGame():
 	if multiplayer.is_server():
 		for i in getPlayerNames():
@@ -81,6 +81,7 @@ func _ready():
 	startMultiplayerBtn.pressed.connect(
 		func():
 			startMultiplayerGame.rpc()
+			startMultiplayerGame()
 	)
 	maxPlayerInput.text_changed.connect(
 		func(text):