refactor(武器): 调整钢管武器的伤害计算和描述

修改钢管武器的伤害计算公式，使用平方根函数替代线性增长
移除蓄力倍率属性，改为固定值0.1
更新武器描述文本以反映新的伤害机制

scripts/Contents/Weapons/Pipe.gd

@@ -3,7 +3,6 @@ extends Weapon
 
 func update(to: int, origin: Dictionary, _entity: EntityBase):
 	origin["atk"] += 1 * to * soulLevel
-	origin["charge"] += 0.05 * (soulLevel - 1)
 	return origin
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")
@@ -14,7 +13,7 @@ func attack(entity: EntityBase):
 			weaponPos.angle_to_point(get_global_mouse_position())
 		):
 		if bullet is PipeBullet:
-			var e = charged(readStore("atk"), readStore("charge"))
+			var e = charged(readStore("atk"), 0.1)
 			bullet.baseDamage = e
 			bullet.energy = e
 			bullet.speed = e

scripts/Structs/Weapon.gd

@@ -177,7 +177,7 @@ func tryAttack(entity: EntityBase):
 			entity.useEnergy(needEnergy)
 		return result
 func charged(base: float, percent: float):
-	return base * (1 + chargedTime / 75 * percent)
+	return base * sqrt(1 + chargedTime / 20 * percent)
 
 # 抽象
 func update(_to: int, origin: Dictionary, _entity: EntityBase):