feat(Bear): 添加新的攻击类型SunDance

为Bear角色添加新的攻击类型SunDance，包含子弹特效和动画。修改了Bear.gd以支持新攻击类型，并创建了SunDance.gd脚本和对应的场景文件。新攻击会生成旋转的彩色子弹，具有不同的颜色和大小变化效果。

scripts/Contents/Characters/Bear.gd

@@ -5,13 +5,19 @@ func register():
 	fields[FieldStore.Entity.MAX_HEALTH] = 2000
 	fields[FieldStore.Entity.MOVEMENT_SPEED] = 0.25
 	attackCooldownMap[0] = 100
+	attackCooldownMap[1] = 100
 func spawn():
 	texture.play("walk")
 func ai():
 	PresetEntityAI.follow(self, currentFocusedBoss, 0)
 	tryAttack(0)
+	tryAttack(1)
 func attack(type):
 	var weaponPos = findWeaponAnchor("normal")
 	if type == 0:
 		for bullet in BulletBase.generate(preload("res://components/Bullets/BossAttack/Bear/ArrowSeven.tscn"), self, weaponPos, deg_to_rad(randf_range(0, 360))):
 			bullet.tracer = currentFocusedBoss
+	elif type == 1:
+		for bullet in BulletBase.generate(preload("res://components/Bullets/BossAttack/Bear/SunDance.tscn"), self, weaponPos, deg_to_rad(randf_range(0, 360))):
+			bullet.damage = 1
+	return true