feat(蓝水晶): 添加蓝水晶子弹追踪和分裂功能

为蓝水晶子弹添加追踪开关和速度提升属性
实现命中敌人时概率分裂钻石的功能
添加武器升华选项以增强蓝水晶能力

scripts/Contents/Bullets/BlueCrystal.gd

@@ -2,6 +2,10 @@ extends BulletBase
 class_name BlueCrystalBullet
 
 var tracer: EntityBase = null
+var canTrace: bool = true
+var speedBoost: float = 0
+var splitRate: float = 0
+
 @onready var trail: GPUParticles2D = $%trail
 
 func ai():
@@ -9,12 +13,22 @@ func ai():
 		var tracker = tracer.getTrackingAnchor()
 		var targetAngle = position.angle_to_point(tracker)
 		trail.rotation = - Vector2.from_angle(rotation).angle_to(Vector2.from_angle(targetAngle)) / (speed / initialSpeed)
-		PresetBulletAI.trace(self, tracker, 0.07)
+		if canTrace:
+			PresetBulletAI.trace(self , tracker, 0.07)
 	else:
 		trail.rotation = 0
-	speed += 0.1
-	PresetBulletAI.forward(self, rotation)
+	speed += 0.1 * (1 + speedBoost)
+	PresetBulletAI.forward(self , rotation)
 func destroy(_beacuseMap: bool):
 	var eff = EffectController.create(ComponentManager.getEffect("BlueCrystalExplosion"), global_position)
 	eff.rotation = rotation
 	eff.shot()
+func succeedToHit(_dmg: float, entity: EntityBase):
+	if entity == tracer:
+		canTrace = false
+	if MathTool.rate(splitRate):
+		for diamond in BulletBase.generate(ComponentManager.getBullet("Diamond2"), entity, position, deg_to_rad(randf_range(0, 360))):
+			if diamond is Diamond2Bullet:
+				diamond.baseDamage = baseDamage * 0.8
+				diamond.parent = self
+				diamond.penerate += penerate