feat(子弹系统): 重构伤害计算并添加音效

将子弹的伤害属性从`damage`重命名为`baseDamage`，并引入`damageMultipliers`数组支持多段伤害
为火山武器添加三段攻击音效并调整伤害倍率
更新相关武器和子弹脚本以适配新的伤害系统

scripts/Contents/Bullets/Arrow.gd

@@ -18,7 +18,7 @@ func ai():
 		trail.emitting = true
 		hitbox.disabled = false
 	speed = (1 - lifeDistancePercent()) * initialSpeed
-	damage = speed * atk
+	baseDamage = speed * atk
 	PresetBulletAI.forward(self, rotation)
 	if speed < 1:
 		tryDestroy()

scripts/Contents/Bullets/BigLaser.gd

@@ -9,7 +9,7 @@ func register():
 func spawn():
 	CameraManager.shake(5000, 100) # 激光会运行5秒（5000毫秒），期间震屏超高强度
 	CameraManager.playAnimation("bigLaser")
-	damage *= launcher.fields[FieldStore.Entity.ATTACK_SPEED]
+	baseDamage *= launcher.fields[FieldStore.Entity.ATTACK_SPEED]
 func ai():
 	rotation = lerp_angle(rotation, ((get_global_mouse_position() - position).angle()), 0.1)
 	position = launcher.texture.global_position

scripts/Contents/Bullets/BossAttack/Bear/ArrowSeven.gd

@@ -13,7 +13,7 @@ var forwarded: bool = false
 
 func register():
 	speed = 1
-	damage = 1
+	baseDamage = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())
 	superlight.material = superlight.material.duplicate()

scripts/Contents/Bullets/BossAttack/Bear/ForeverRainbow.gd

@@ -5,7 +5,7 @@ extends BulletBase
 var myColor: Color
 
 func register():
-	damage = 1
+	baseDamage = 1
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())

scripts/Contents/Bullets/BossAttack/Bear/LightGun.gd

@@ -10,7 +10,7 @@ extends BulletBase
 var myColor: Color
 func register():
 	speed = 1
-	damage = 1
+	baseDamage = 1
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())

scripts/Contents/Bullets/BossAttack/Bear/SunDance.gd

@@ -11,7 +11,7 @@ var myColor: Color
 
 func register():
 	speed = 0
-	damage = 1
+	baseDamage = 1
 	penerate = 1
 func spawn():
 	myColor = allColor.gradient.sample(randf())

scripts/Contents/Bullets/BossAttack/KukeMC/HeavyCrystal.gd

@@ -15,5 +15,5 @@ func ai():
 		track.visible = false
 		hitbox.disabled = false
 		PresetBulletAI.forward(self, rotation)
-		damage = speed / 5
+		baseDamage = speed / 5
 		speed *= 1.15

scripts/Contents/Bullets/ChainGun.gd

@@ -8,7 +8,7 @@ var splits: float = 10.0
 func spawn():
 	for j in count:
 		for i in BulletBase.generate(ComponentManager.getBullet("PurpleCrystalSmall"), launcher, anchor.global_position, rotation):
-			i.damage = damage
+			i.damage = baseDamage
 			var dir = Vector2.from_angle(i.rotation).rotated(deg_to_rad(-90))
 			i.global_position += dir * (count - j * 2) * splits / 2
 func ai():

scripts/Contents/Bullets/ChickSprint.gd

@@ -7,7 +7,7 @@ func register():
 	speed = 0
 	penerate = 1
 func ai():
-	damage = launcher.velocity.length() / 500 * atk
+	baseDamage = launcher.velocity.length() / 500 * atk
 	PresetBulletAI.lockLauncher(self, launcher, true)
 	if !launcher.sprinting:
 		tryDestroy()

scripts/Contents/Bullets/Diamond.gd

@@ -4,7 +4,7 @@ class_name Diamond
 const traceTime = 1500
 
 func register():
-	damage = 2
+	baseDamage = 2
 func ai():
 	PresetBulletAI.forward(self, rotation)
 	if timeLived() < traceTime:

scripts/Contents/Bullets/Pencil.gd

@@ -2,7 +2,7 @@ extends BulletBase
 class_name Pencil
 
 func register():
-	damage = 20
+	baseDamage = 20
 func spawn():
 	await TickTool.millseconds(1000)
 	hitbox.disabled = false

scripts/Contents/Bullets/SevenSoul.gd

@@ -20,7 +20,7 @@ func register():
 		func(area):
 			var bullet = BulletTool.fromArea(area)
 			if bullet and BulletTool.canDamage(bullet, launcher):
-				launcher.storeEnergy(damage * 2)
+				launcher.storeEnergy(baseDamage * 2)
 	)
 func spawn():
 	modulate = Color(colors[index % colors.size()])

scripts/Contents/Bullets/Star.gd

@@ -2,6 +2,6 @@ extends BulletBase
 class_name Star
 
 func register():
-	damage = 1
+	baseDamage = 1
 func ai():
 	PresetBulletAI.forward(self, rotation)

scripts/Contents/Bullets/Volcano.gd

@@ -25,4 +25,4 @@ func generateShadow():
 		false, false, true, true
 	):
 		if i is VolcanoShadow:
-			i.damage = damage
+			i.baseDamage = baseDamage