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/Characters/Rooster.gd

@@ -1,6 +1,9 @@
 extends EntityBase
 class_name Rooster
 
+func register():
+	attackCooldownMap[0] = 200
+	attackCooldownMap[1] = 6000
 func ai():
 	texture.play("walk")
 	var direction = Vector2(
@@ -11,10 +14,8 @@ func ai():
 	if direction.length() == 0:
 		texture.play("idle")
 	if Input.is_action_pressed("attack"):
-		cooldownUnit = 200
 		tryAttack(0)
 	elif Input.is_action_pressed("attack2"):
-		cooldownUnit = 6000
 		tryAttack(1)
 	if Input.is_action_just_pressed("sprint"):
 		trySprint()