refactor(BulletBase/EntityBase): 重构子弹和实体属性系统

将子弹的fields属性拆分为独立的speed、damage和penerate变量
为所有子弹和实体添加register方法用于初始化属性
统一攻击冷却时间管理为attackCooldownMap
移除FieldStore中不再使用的Bullet相关枚举和映射

scripts/Contents/Bullets/BigLaser.gd

@@ -1,10 +1,14 @@
 extends BulletBase
 class_name BigLaser # 这个子弹是玩家的超级武器，耗能高，dps也高
 
+func register():
+	speed = 0
+	damage = 35
+	penerate = 1
 func spawn():
 	CameraManager.shake(5000, 150) # 激光会运行5秒（5000毫秒），期间震屏超高强度
 	CameraManager.playAnimation("bigLaser")
-	fields[FieldStore.Bullet.DAMAGE] *= launcher.fields[FieldStore.Entity.ATTACK_SPEED]
+	damage *= 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