feat(SevenSoul): 增强七魂武器功能并修复子弹伤害逻辑

为七魂武器添加攻击力属性并调整伤害和治疗机制
修复子弹工具中空引用检查缺失的问题
移除子弹基类中冗余的空检查逻辑
更新武器描述以反映新功能
调整子弹粒子效果和伤害计算方式

scripts/Contents/Weapons/SevenSoul.gd

@@ -4,9 +4,15 @@ extends Weapon
 func attack(entity: EntityBase):
 	playSound("attack")
 	for i in 6:
-		for j in BulletBase.generate(ComponentManager.getBullet("SevenSoul"), entity, entity.texture.global_position, 0):
-			j.index = i
+		for bullet in BulletBase.generate(ComponentManager.getBullet("SevenSoul"), entity, entity.texture.global_position, 0):
+			if bullet is SevenSoulBullet:
+				bullet.index = i
+				bullet.baseDamage = readStore("atk")
+				bullet.energyCollect = readStore("dmg")
+				bullet.healAmount = readStore("heal")
 		await TickTool.millseconds(15000 / 6.0)
 func update(to, origin, _entity):
 	origin["atk"] += 1 * to * soulLevel
+	origin["dmg"] += 0.02 * to * soulLevel
+	origin["heal"] += 0.1 * to * soulLevel
 	return origin