feat(保存系统): 实现游戏存档功能

添加SaveEngine类用于处理游戏存档的序列化、加载和应用
修改GameBusManager在游戏重启时自动保存和加载存档
扩展JsonTool功能以支持文件解析和字符串序列化
更新StarterPanel添加教程观看状态保存

scripts/Contents/Panels/Starter.gd

@@ -32,6 +32,7 @@ var historyStack
 static var GAMEMODE_MAP_WAVE = [Wave.WAVE_NORMAL, Wave.WAVE_BOSSRUSH, Wave.WAVE_MOWING, Wave.WAVE_TESTBOSS]
 static var START_CHARACTERS = ["MuyangDog", "Lynx", "HCN"]
 static var buildingShader: bool = true
+static var tutorialWatched: bool = false
 static var selectingFeed: bool = true
 static var selectedCharacter: String = MathTool.randomChoiceFrom(START_CHARACTERS)
 
@@ -100,6 +101,7 @@ func _ready():
 		func(on: bool):
 			useTutorialBtn.text = "观看" if on else "跳过"
 	)
+	useTutorialBtn.button_pressed = tutorialWatched
 	multiplayer.connection_failed.connect(
 		func():
 			setState(MultiplayerState.ConnectionState.DISCONNECTED)