feat(多人游戏): 添加多人游戏状态管理和服务器配置功能

- 新增 MultiplayerState 类管理连接状态和服务器操作
- 在 Starter 面板中添加服务器配置和状态显示
- 实现服务器启动和最大玩家数设置功能

scripts/Contents/Panels/Starter.gd

@@ -4,6 +4,12 @@ extends FullscreenPanelBase
 @onready var diffEdit: HSlider = $"%diffEdit"
 @onready var startBtn: Button = $"%startBtn"
 @onready var levelShow: Label = $"%levelShow"
+@onready var hostInput: LineEdit = $"%hostInput"
+@onready var portInput: LineEdit = $"%portInput"
+@onready var launchBtn: Button = $"%launchBtn"
+@onready var connectBtn: Button = $"%connectBtn"
+@onready var maxPlayerInput: LineEdit = $"%maxPlayerInput"
+@onready var connectionState: Label = $"%connectionState"
 
 func _ready():
 	diffEdit.min_value = GameRule.difficultyRange.x
@@ -13,6 +19,20 @@ func _ready():
 			Wave.next()
 			UIState.closeCurrentPanel()
 	)
+	maxPlayerInput.text_changed.connect(
+		func(text):
+			MultiplayerState.maxPlayer = int(text)
+	)
+	launchBtn.pressed.connect(
+		func():
+			MultiplayerState.launchServer(int(portInput.text))
+	)
+	setState(MultiplayerState.ConnectionState.DISCONNECTED)
 func _physics_process(_delta):
 	levelShow.text = "%d ∈ [%d, %d]" % [diffEdit.value, diffEdit.min_value, diffEdit.max_value]
 	GameRule.difficulty = diffEdit.value
+
+func setState(state: MultiplayerState.ConnectionState):
+	MultiplayerState.state = state
+	connectionState.text = MultiplayerState.stateTextMap[state]
+	connectionState.modulate = MultiplayerState.stateColorMap[state]