feat: 删除FeedCard场景，重构Feed类，更新UI组件

scripts/Structs/Feed.gd

@@ -1,3 +1,15 @@
 @tool
 extends PanelContainer
-class_name Feed
+class_name Feed
+
+@export var avatarTexture: Texture2D = null
+@export var displayName: String = "未命名饲料"
+@export var fields: Array[FieldStore.Entity] = []
+@export var values: Array[float] = []
+@export var costs: Array[ItemStore.ItemType] = []
+@export var counts: Array[int] = []
+
+@onready var avatar: TextureRect = $"%avatar"
+@onready var nameLabel: Label = $"%name"
+@onready var fieldsBox: VBoxContainer = $"%fields"
+@onready var costsBox: VBoxContainer = $"%costs"