refactor(CameraManager): 重构相机震动系统并添加强度参数

- 移除shaking布尔变量，改用shakeIntensity控制震动强度
- 修改shake方法接受强度参数，支持叠加震动效果
- 简化震动逻辑，移除调试打印语句

feat(ItemDropped): 添加物品自动收集功能

- 当物品与玩家距离小于60时自动收集并销毁
- 调用玩家collectItem方法处理收集逻辑

refactor(EntityBase): 重构物品收集逻辑

- 将物品收集逻辑从信号回调移至collectItem方法
- 移除itemCollected信号及相关UI更新代码
- 简化hurtbox连接逻辑

style(World): 调整动画资源顺序

- 交换两个动画资源的定义顺序

scripts/Tools/CameraManager.gd

@@ -2,11 +2,9 @@
 extends Camera2D
 class_name CameraManager
 
-@export var shakeOffset: float = 100
-
 @onready var animator: AnimationPlayer = $"%animator"
 
-var shaking: bool = false
+var shakeIntensity: float = 0
 
 static var instance: CameraManager = null
 
@@ -15,14 +13,11 @@ func _ready():
 func _physics_process(_delta):
 	if is_instance_valid(UIState.player):
 		position = UIState.player.position
-		if shaking:
-			position += MathTool.randv2_range(shakeOffset)
+		position += MathTool.randv2_range(shakeIntensity)
 
-static func shake(millseconds: int = 1000):
-	print("shake start")
-	instance.shaking = true
+static func shake(millseconds: int, intensity: float = 10):
+	instance.shakeIntensity += intensity
 	await TickTool.millseconds(millseconds)
-	instance.shaking = false
-	print("shake end")
+	instance.shakeIntensity -= intensity
 static func playAnimation(animation: String):
 	instance.animator.play(animation)