fix(Volcano.gd): 硬编码动画播放速度替换原攻击速度计算

将原本根据攻击速度计算的动画缩放倍率改为固定0.75，简化子弹动画速度控制逻辑

scripts/Contents/Bullets/Volcano.gd

@@ -10,7 +10,7 @@ var dmg5: float = 0
 var splitAngle: float = 10
 
 func spawn():
-	animator.speed_scale = launcher.fields[FieldStore.Entity.ATTACK_SPEED] * (1.0 - 0.1)
+	animator.speed_scale = 0.75
 	setupCuttable(0.2)
 func ai():
 	PresetBulletAI.lockLauncher(self , launcher, true)