feat(武器/子弹): 增强酸性武器伤害并添加子弹分裂功能

- 提高酸性武器的基础攻击力和弱点攻击伤害
- 为酸性子弹添加分裂功能，分裂时保持原子弹的缩放方向

scripts/Contents/Bullets/AcidC.gd

@@ -5,3 +5,6 @@ func ai():
     super.ai()
     scale *= 1.01
     modulate.a = 1 - timeLived() / lifeTime
+func split(newBullet: BulletBase, _index: int, _total: int, _lastBullet: float):
+    newBullet.scale = scale.sign()
+    return newBullet

scripts/Contents/Weapons/AcidWind.gd

@@ -4,14 +4,14 @@ extends Weapon
 var acids: Array[String] = ["AcidS", "AcidN", "AcidCl", "AcidP", "AcidC"]
 
 func update(to: int, origin: Dictionary, _entity: EntityBase):
-    origin["atk"] += 0.05 * to * soulLevel
+    origin["atk"] += 0.075 * to * soulLevel
     origin["c-atk"] *= soulLevel
     origin["cl-atkspeed"] *= soulLevel
     origin["cl-speed"] *= soulLevel
     origin["n-atk"] *= soulLevel
     origin["p-offset"] *= soulLevel
     origin["s-count-max"] *= soulLevel
-    origin["weakatk"] = 0.025 * soulLevel
+    origin["weakatk"] = 0.05 * soulLevel
     return origin
 func attack(entity: EntityBase):
     for bullet in BulletBase.generate(