feat: 更新饲料和物品显示逻辑，添加香蕉饲料场景，重构字段显示功能

scripts/Statemachine/ItemShow.gd

@@ -1,5 +1,6 @@
 @tool
 extends HBoxContainer
+class_name ItemShow
 
 @export var type: ItemStore.ItemType = ItemStore.ItemType.BASEBALL
 @export var count: int = 0
@@ -7,6 +8,6 @@ extends HBoxContainer
 @onready var avatarTexture: TextureRect = $"%avatar"
 @onready var countLabel: Label = $"%count"
 
-func _process(_delta):
+func _ready():
 	avatarTexture.texture = load("res://resources/items/%s.svg" % ItemStore.idMap[type])
 	countLabel.text = str(count)