feat(饲料卡片): 添加饲料品质显示功能

实现饲料品质的枚举定义和颜色映射，修改FeedCardBase使用FeedName组件显示品质

scripts/Statemachine/FeedName.gd

@@ -0,0 +1,42 @@
+@tool
+extends CenterContainer
+class_name FeedName
+
+enum Quality {
+	WASTE,
+	COMMON,
+	RARE,
+	EPIC,
+	LEGENDARY,
+}
+
+@export var displayName: String = "未命名饲料"
+@export var quality: Quality = Quality.COMMON
+@export var qualityColorMap = {
+	Quality.WASTE: Color(),
+	Quality.COMMON: Color(),
+	Quality.RARE: Color(),
+	Quality.EPIC: Color(),
+	Quality.LEGENDARY: Color()
+}
+@export var qualityNameMap = {
+	Quality.WASTE: "常见",
+	Quality.COMMON: "普通",
+	Quality.RARE: "稀有",
+	Quality.EPIC: "史诗",
+	Quality.LEGENDARY: "传说"
+}
+@export var qualityRandomWeight = {
+	Quality.WASTE: 5,
+	Quality.COMMON: 50,
+	Quality.RARE: 10,
+	Quality.EPIC: 5,
+	Quality.LEGENDARY: 1
+}
+
+@onready var label: RichTextLabel = $"%label"
+
+func _physics_process(_delta):
+	label.text = "[b][color=%s]%s[/color][/b]" % ["#" + color().to_html(false), displayName]
+func color():
+	return qualityColorMap[quality] as Color