feat(武器系统): 添加七彩矢武器及其相关资源

添加新的七彩矢武器系统，包括武器脚本、子弹特效、着色器和动画资源
为Rooster角色添加新武器选项
实现光效追踪和颜色渐变效果
调整窗口模式为2（全屏）

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

@@ -0,0 +1,42 @@
+extends BulletBase
+
+@export var allColor: GradientTexture1D = null
+
+@onready var superlight: Node2D = $"%superlight"
+@onready var trail: GPUParticles2D = $"%trail"
+
+var myColor: Color
+var tracer: EntityBase = null
+var forwardTime: float = 500
+var forwarded: bool = false
+
+func register():
+	speed = 1
+	damage = 5
+	penerate = 1
+func spawn():
+	myColor = allColor.gradient.sample(randf())
+	superlight.material = superlight.material.duplicate()
+	trail.process_material = trail.process_material.duplicate()
+	setColor(myColor)
+
+
+func ai():
+	superlight.global_rotation_degrees = 90
+	PresetBulletAI.forward(self, rotation)
+	if timeLived() <= forwardTime:
+		speed = 10 * ((forwardTime - timeLived()) / forwardTime)
+	elif forwarded:
+		if timeLived() < forwardTime + 1000:
+			speed = clamp((timeLived() - forwardTime) / 75, 0, 30)
+			if is_instance_valid(tracer):
+				PresetBulletAI.trace(self, tracer.position, 0.1)
+	else:
+		forwarded = true
+
+
+func setColor(color: Color):
+	texture.self_modulate = color
+	var mat: ParticleProcessMaterial = trail.process_material
+	mat.color = color
+	superlight.material.set_shader_parameter("color", color)