feat: 添加掉落物功能，更新饲料和物品显示，重构相关UI组件

components/Characters/Chick.tscn

@@ -34,6 +34,8 @@ animations = [{
 script = ExtResource("2_r6bub")
 cooldownUnit = 200.0
 displayName = "小鸡"
+drops = Array[int]([0, 1])
+dropCounts = Array[Vector2]([Vector2(10, 20), Vector2(7, 14)])
 
 [node name="hurt" parent="sounds" index="2"]
 stream = ExtResource("3_ik1xf")

components/Characters/Hen.tscn

@@ -34,6 +34,8 @@ radius = 40.0
 [node name="Hen" instance=ExtResource("1_twxai")]
 script = ExtResource("2_8u5a0")
 cooldownUnit = 500.0
+drops = Array[int]([0, 1])
+dropCounts = Array[Vector2]([Vector2(4, 8), Vector2(2, 6)])
 
 [node name="hurt" parent="sounds" index="2"]
 stream = ExtResource("3_ojyt7")