refactor(追踪系统): 统一使用getTrackingAnchor方法获取追踪目标位置

修改多个子弹脚本和EntityBase，使用统一的getTrackingAnchor方法获取追踪目标位置
在BulletBase中增加目标有效性检查
调整Wave配置和Rooster武器顺序

scripts/Contents/Bullets/Diamond.gd

@@ -9,4 +9,4 @@ func ai():
 	canDamageSelf = !(timeLived() >= traceTime)
 	PresetAIs.forward(self, rotation)
 	if timeLived() < traceTime:
-		PresetAIs.trace(self, launcher.currentFocusedBoss.position, 0.05)
+		PresetAIs.trace(self, launcher.currentFocusedBoss.getTrackingAnchor(), 0.05)

scripts/Contents/Bullets/LGBTBullet.gd

@@ -11,7 +11,7 @@ func ai():
 	speed *= 1.05
 	speed = clamp(speed, 0, 20)
 	if is_instance_valid(tracer) and timeLived() < maxTraceTime:
-		PresetAIs.trace(self, tracer.position, clamp(speed / 50 * tracePower, 0, 1))
+		PresetAIs.trace(self, tracer.getTrackingAnchor(), clamp(speed / 50 * tracePower, 0, 1))
 	PresetAIs.forward(self, rotation)
 func destroy(_b):
 	EffectController.create(preload("res://components/Effects/LGBTBoom.tscn"), position).shot()

scripts/Contents/Bullets/VectorStar.gd

@@ -15,4 +15,4 @@ func ai():
 	else:
 		forwarded = true
 		if is_instance_valid(tracer):
-			rotation = position.angle_to_point(tracer.position)
+			rotation = position.angle_to_point(tracer.getTrackingAnchor())