fix: 修复实体属性应用函数未返回默认值的问题

修改FieldStore.gd中entityApplier的函数，确保所有函数都返回true
修复Feed.gd中get方法调用缺少默认参数的问题

scripts/Structs/Feed.gd

@@ -68,7 +68,7 @@ func apply(entity: EntityBase):
 		for i in range(min(fields.size(), fieldValues.size())):
 			var field = fields[i]
 			var value = fieldValues[i]
-			var applier = FieldStore.entityApplier.get(field, null)
+			var applier = FieldStore.entityApplier.get(field)
 			if !applier or applier.call(entity, value):
 				entity.fields[field] += value
 				entity.fields[field] = clamp(entity.fields[field], 0, FieldStore.entityMaxValueMap.get(field, INF))

scripts/Tools/FieldStore.gd

@@ -80,12 +80,15 @@ static var entityMaxValueMap = {
 static var entityApplier = {
 	Entity.MAX_HEALTH: func(entity, value):
 		entity.health += value
+		return true
 		,
 	Entity.EXTRA_APPLE_MAX: func(entity, value):
 		entity.inventoryMax[ItemStore.ItemType.APPLE] += value
+		return true
 		,
 	Entity.EXTRA_BULLET_COUNT: func(entity, value):
 		entity.fields[Entity.OFFSET_SHOOT] += value * 5
+		return true
 		,
 }