feat(角色): 更新KukeMC角色资源与逻辑

添加KukeMC角色的新动画资源(pico-a.svg, pico-b.svg, pico-c.svg, pico-d.svg)
调整角色基础属性和技能逻辑：
- 增加百分比生命值计算方法
- 修改攻击冷却时间和治疗机制
- 优化子弹生成逻辑
- 更新角色纹理和动画帧
- 调整碰撞框大小和位置

scripts/Contents/Characters/KukeChild.gd

@@ -4,7 +4,7 @@ class_name KukeChild
 var masterMine: KukeMC
 
 func register():
-	fields[FieldStore.Entity.MAX_HEALTH] = 20
+	fields[FieldStore.Entity.MAX_HEALTH] = 30
 	fields[FieldStore.Entity.MOVEMENT_SPEED] = 0.35
 	attackCooldownMap[0] = 100
 	attackCooldownMap[1] = 8000
@@ -22,4 +22,4 @@ func attack(type):
 		BulletBase.generate(ComponentManager.getBullet("HeavyCrystal"), self, findWeaponAnchor("normal"), position.angle_to_point(currentFocusedBoss.position))
 func kill():
 	if is_instance_valid(masterMine):
-		masterMine.tryHeal(100)
+		masterMine.tryHeal(percentHealth(0.05))