feat(武器): 完善扶桑元神武器机制

- 调整格挡子弹的基础伤害为0
- 增加气力上限和格挡次数的可配置性
- 实现乾坤剑伤害随武器等级提升
- 更新武器描述文本以反映新机制
- 修复乾坤剑生命周期与生成速度的同步问题

scripts/Contents/Weapons/Tree.gd

@@ -1,6 +1,11 @@
 @tool
 extends Weapon
 
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 5 * to * soulLevel
+	origin["count"] += 1 * (soulLevel - 1)
+	origin["max"] += 2 * (soulLevel - 1)
+	return origin
 func attack(entity: EntityBase):
 	for bullet in BulletBase.generate(
 		ComponentManager.getBullet("Parrier"),
@@ -9,5 +14,7 @@ func attack(entity: EntityBase):
 		entity.findWeaponAnchor("normal").angle_to_point(get_global_mouse_position()),
 	):
 		if bullet is ParrierBullet:
-			pass
+			bullet.atk = readStore("atk")
+			bullet.maxParryTimes = readStore("count")
+			bullet.maxBallCount = readStore("max")
 	return true