feat: 添加游戏控制和管理功能

- 新增GameControl节点用于统一处理游戏重启和退出
- 添加GameBusManager管理游戏重启时的资源清理
- 修改Pause和GameOver面板使用新的GameControl
- 为EffectController和ItemDropped添加分组管理
- 统一使用WorldManager管理游戏时间

scripts/Contents/Panels/GameOver.gd

@@ -3,23 +3,7 @@ extends FullscreenPanelBase
 
 @onready var audio: AudioStreamPlayer2D = $%audio
 @onready var deadreason: RichTextLabel = $%deadreason
-@onready var returnBtn: Button = $%returnBtn
-@onready var exitBtn: Button = $%exitBtn
-
-func _ready():
-	returnBtn.pressed.connect(
-		func():
-			returnBtn.disabled = true
-			for bullet in get_tree().get_nodes_in_group("bullets"):
-				bullet.queue_free()
-			for entity in get_tree().get_nodes_in_group("entities"):
-				entity.queue_free()
-			UIState.setPanel("Starter")
-	)
-	exitBtn.pressed.connect(
-		func():
-			get_tree().quit()
-	)
+@onready var gameControl: GameControl = $%gameControl
 
 func beforeOpen(args: Array = []):
 	audio.play()
@@ -28,5 +12,4 @@ func beforeOpen(args: Array = []):
 	for item in OutGameStorage.inventory:
 		OutGameStorage.inventory[item] += UIState.player.inventory[item]
 func afterOpen(_args: Array = []):
-	returnBtn.disabled = false
-	exitBtn.disabled = false
+	gameControl.enable()

scripts/Contents/Panels/Pause.gd

@@ -1,10 +1,7 @@
 @tool
 extends FullscreenPanelBase
 
-@onready var aboutBtn: Button = $"%aboutBtn"
+@onready var gameControl: GameControl = $%gameControl
 
-func _ready():
-	aboutBtn.pressed.connect(
-		func():
-			UIState.setPanel("Thanks")
-	)
+func afterOpen(_args: Array = []):
+	gameControl.enable()