feat(子弹效果): 增强彩虹子弹和光枪的视觉效果

- 修改彩虹子弹的着色器参数和颜色处理
- 更新光枪的着色器和材质参数
- 调整熊角色攻击时的子弹数量
- 优化粒子效果和材质设置

scripts/Contents/Bullets/BossAttack/Bear/ForeverRainbow.gd

@@ -17,4 +17,5 @@ func ai():
 	PresetBulletAI.forward(self, rotation)
 
 func setColor(color: Color):
-	texture.modulate = color
+	texture.self_modulate = color
+	texture.modulate.v *= 10

scripts/Contents/Bullets/BossAttack/Bear/LightGun.gd

@@ -17,7 +17,7 @@ func spawn():
 	track.material = track.material.duplicate()
 	points.process_material = points.process_material.duplicate()
 	setColor(myColor)
-	track.size.x = length
+	track.size.y = length
 	TickTool.modifyAnimationKey(animator, "spawn", "sword:position:x", Animation.TrackType.TYPE_BEZIER, 2.5, length / -2)
 	TickTool.modifyAnimationKey(animator, "spawn", "sword:position:x", Animation.TrackType.TYPE_BEZIER, 3, length / 2)
 	TickTool.modifyAnimationKey(animator, "spawn", "%hitbox:position:x", Animation.TrackType.TYPE_BEZIER, 2.5, length / -2)
@@ -25,8 +25,9 @@ func spawn():
 	await TickTool.millseconds(2500)
 	points.emitting = true
 func setColor(color: Color):
+	color.v *= 2
 	var result = Color(color)
 	result.a = 0
-	track.material.set_shader_parameter("color", result)
+	track.material.set_shader_parameter("laser_color", result)
 	sword.modulate = color
 	points.process_material.color = color