feat(游戏平衡): 调整敌人生成和子弹行为

- 将敌人数量增长逻辑移至GameRule并调整计算公式
- 修改鸡的攻击行为，子弹现在会朝向玩家发射
- 调整子弹伤害值和旋转动画
- 减少玩家初始苹果数量并增加敌人掉落苹果数量
- 修改BOSS出现波数为第8波
- 移除无用属性和优化代码结构

components/Scenes/UI.tscn

@@ -48,19 +48,16 @@ alignment = 1
 [node name="baseball" parent="root/container/items" instance=ExtResource("3_o2oi4")]
 unique_name_in_owner = true
 layout_mode = 2
-autoFree = null
 
 [node name="basketball" parent="root/container/items" instance=ExtResource("3_o2oi4")]
 unique_name_in_owner = true
 layout_mode = 2
 type = 1
-autoFree = null
 
 [node name="apple" parent="root/container/items" instance=ExtResource("3_o2oi4")]
 unique_name_in_owner = true
 layout_mode = 2
 type = 2
-autoFree = null
 
 [node name="panels" type="Control" parent="root"]
 unique_name_in_owner = true