refactor(武器系统): 移除武器能量消耗并调整数值显示

- 从多个武器脚本中移除needEnergy变量
- 更新武器描述中的数值变化显示
- 删除不再使用的Arrow7武器相关文件
- 为部分武器添加costBeachball属性

scripts/Contents/Weapons/Arrow7.gd

@@ -1,15 +0,0 @@
-@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

scripts/Contents/Weapons/BigLaser.gd

@@ -5,7 +5,6 @@ class_name BigLaserWeapon
 func update(to: int, origin: Dictionary, _entity: EntityBase):
 	origin["atk"] += 5 * to * soulLevel
 	origin["time"] /= 1 + 0.05 * to * soulLevel
-	needEnergy += 5
 	return origin
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")

scripts/Contents/Weapons/LGBTWeapon.gd

@@ -8,7 +8,6 @@ func update(to: int, origin: Dictionary, _entity: EntityBase):
 	origin["power"] += 0.05 * to * soulLevel
 	origin["trace"] += 0.25 * to * soulLevel
 	origin["angle"] /= 1 + 0.05 * to * soulLevel
-	needEnergy += 1
 	return origin
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")

scripts/Contents/Weapons/MushroomPickaxe.gd

@@ -5,7 +5,6 @@ func update(to: int, origin: Dictionary, _entity: EntityBase):
 	origin["atk"] += 1 * to * soulLevel
 	origin["rate"] += 0.04 * to * soulLevel
 	origin["count"] += 1 * to * soulLevel
-	needEnergy += 0.5
 	return origin
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")

scripts/Contents/Weapons/VectorStarWeapon.gd

@@ -7,7 +7,6 @@ func update(to: int, origin: Dictionary, _entity: EntityBase):
 	origin["forwardtime"] /= 1 + 0.05 * to * soulLevel
 	origin["mincount"] += 0.5 * to * soulLevel
 	origin["maxcount"] += 1.5 * to * soulLevel
-	needEnergy += 2
 	return origin
 func attack(entity: EntityBase):
 	var weaponPos = entity.findWeaponAnchor("normal")