feat: 添加团子猫饲料和能量系统改进

- 新增团子猫饲料资源及配置
- 扩展FieldStore枚举添加节能和能量再生效率
- 改进EntityBase能量存储和使用逻辑
- 添加WorldManager运行时间追踪功能

scripts/Tools/WorldManager.gd

@@ -3,10 +3,15 @@ class_name WorldManager
 
 static var rootNode: Node2D
 static var tree: SceneTree
+static var runningTime: float = 0
 
 func _ready():
 	tree = get_tree()
 	rootNode = self
-func _physics_process(_delta):
+func _physics_process(delta):
+	runningTime += delta
 	if EntityBase.mobCount() == 0:
 		UIState.setPanel("MakeFeed")
+
+static func getTime():
+	return runningTime