fix: 调整子弹飞行距离和速度参数

将VectorStar子弹的lifeDistance从3000减少到2000，并调整速度计算中的分母从20改为30，以平衡游戏难度

components/Bullets/VectorStar.tscn

@@ -43,7 +43,7 @@ alpha_curve = SubResource("CurveTexture_c22if")
 
 [node name="VectorStar" instance=ExtResource("1_fyvdf")]
 script = ExtResource("2_1u5ed")
-lifeDistance = 3000.0
+lifeDistance = 2000.0
 
 [node name="texture" parent="." index="0"]
 rotation = 0.0174533

scripts/Contents/Bullets/VectorStar.gd

@@ -11,7 +11,7 @@ func ai():
 	if timeLived() <= forwardTime:
 		speed = 10 * ((forwardTime - timeLived()) / forwardTime)
 	elif forwarded:
-		speed = (timeLived() - forwardTime) / 20
+		speed = (timeLived() - forwardTime) / 30
 	else:
 		forwarded = true
 		if is_instance_valid(tracer):