fix: 修复子弹伤害计算并添加命中成功回调

- 在EntityBase.gd中添加takeDamage方法的返回值
- 修改BigLaser.gd中的applyDot延迟时间计算方式并添加succeedToHit方法
- 在BulletBase.gd中完善伤害处理流程，添加命中回调机制

scripts/Statemachine/BulletBase.gd

@@ -54,7 +54,8 @@ func hit(target: Node):
 	if !canDamageSelf && entity == launcher: return
 	if !indisDamage && !GameRule.allowFriendlyFire:
 		if entity.isPlayer() == launcher.isPlayer(): return
-	entity.takeDamage(self, MathTool.rate(launcher.fields.get(FieldStore.Entity.CRIT_RATE) + GameRule.critRateInfluenceByLuckValue * launcher.fields[FieldStore.Entity.LUCK_VALUE]))
+	var damage = entity.takeDamage(self, MathTool.rate(launcher.fields.get(FieldStore.Entity.CRIT_RATE) + GameRule.critRateInfluenceByLuckValue * launcher.fields[FieldStore.Entity.LUCK_VALUE]))
+	succeedToHit(damage)
 	if MathTool.rate(fullPenerate()):
 		fields[FieldStore.Bullet.PENERATE] -= entity.fields[FieldStore.Entity.PENARATION_RESISTANCE]
 	else:
@@ -77,6 +78,8 @@ func spawn():
 	pass
 func applyDot():
 	pass
+func succeedToHit(_dmg: float):
+	pass
 
 static func generate(
 		bullet: PackedScene,