feat(武器系统): 为链式枪和紫水晶子弹添加能量循环机制

- 在紫水晶子弹类中添加能量循环相关变量和方法
- 修改链式枪子弹生成逻辑以传递能量循环属性
- 为链式枪武器添加5个新的升华选项，包括能量回收功能
- 更新攻击方法以处理新增的穿透和能量循环属性

scripts/Contents/Bullets/ChainGun.gd

@@ -1,21 +1,27 @@
 extends BulletBase
+class_name ChainGunBullet
 
 var count: int = 0
 var splits: float = 0
+var cycleRate: float = 0
+var cycleCount: float = 0
 
 @onready var anchor: Node2D = $"%anchor"
 
 func spawn():
-	for j in count:
-		for i in BulletBase.generate(
+	for i in count:
+		for bullet in BulletBase.generate(
 			ComponentManager.getBullet("PurpleCrystalSmall"),
 			launcher,
 			anchor.global_position,
 			rotation + deg_to_rad(splits * randf_range(-1, 1))
 		):
-			if i is BulletBase:
-				var dir = Vector2.from_angle(i.rotation).rotated(deg_to_rad(-90))
-				i.baseDamage = baseDamage
-				i.position += dir * (count - j * 2) * 10 / 2
+			if bullet is PurpleCrystalBullet:
+				var dir = Vector2.from_angle(bullet.rotation).rotated(deg_to_rad(-90))
+				bullet.baseDamage = baseDamage
+				bullet.position += dir * (count - i * 2) * 10 / 2
+				bullet.penerate += penerate
+				bullet.cycleRate = cycleRate
+				bullet.cycleCount = cycleCount
 func ai():
-	PresetBulletAI.lockLauncher(self, launcher, true)
+	PresetBulletAI.lockLauncher(self , launcher, true)

scripts/Contents/Bullets/PurpleCrystal.gd

@@ -1,8 +1,17 @@
 extends BulletBase
+class_name PurpleCrystalBullet
+
+var cycleRate: float = 0
+var cycleCount: float = 0
+var cycled: bool = false
 
 func ai():
-	PresetBulletAI.forward(self, rotation)
+	PresetBulletAI.forward(self , rotation)
 func destroy(_beacuseMap: bool):
 	var eff = EffectController.create(ComponentManager.getEffect("PurpleCrystalExplosion"), global_position)
 	eff.rotation = rotation
 	eff.shot()
+func succeedToHit(_dmg: float, entity: EntityBase):
+	if MathTool.rate(cycleRate):
+		entity.storeEnergy(cycleCount)
+		cycled = true