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

resources/sounds/effect/sword1.mp3.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://cer3lxbxqw5pq"
+path="res://.godot/imported/sword1.mp3-348dbff4d27421d2476a13d63c45effb.mp3str"
+
+[deps]
+
+source_file="res://resources/sounds/effect/sword1.mp3"
+dest_files=["res://.godot/imported/sword1.mp3-348dbff4d27421d2476a13d63c45effb.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

resources/sounds/effect/sword2.mp3.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://cfwu55dfgs4bl"
+path="res://.godot/imported/sword2.mp3-768d8bd5124ad729116b92c691ace04c.mp3str"
+
+[deps]
+
+source_file="res://resources/sounds/effect/sword2.mp3"
+dest_files=["res://.godot/imported/sword2.mp3-768d8bd5124ad729116b92c691ace04c.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

resources/sounds/effect/sword3.mp3.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://bm2o8hu7nyqh1"
+path="res://.godot/imported/sword3.mp3-9a333562648f03db1b1227875cf2428b.mp3str"
+
+[deps]
+
+source_file="res://resources/sounds/effect/sword3.mp3"
+dest_files=["res://.godot/imported/sword3.mp3-9a333562648f03db1b1227875cf2428b.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4