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/Weapons/Arrow7.gd

@@ -0,0 +1,15 @@
+@tool
+extends Weapon
+class_name Arrow7Weapon
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 5 * to
+	origin["count"] += 1 * to
+	return origin
+func attack(entity: EntityBase):
+	var weaponPos = entity.findWeaponAnchor("normal")
+	for i in range(readStore("count")):
+		for bullet in BulletBase.generate(preload("res://components/Bullets/BossAttack/Bear/ArrowSeven.tscn"), entity, weaponPos, deg_to_rad(randf_range(0, 360))):
+			bullet.damage = readStore("atk")
+			bullet.tracer = EntityTool.findClosetEntity(entity.position, get_tree(), false, true)
+	return true