KORAIL_STORE

[API] GET /api/use_station_list

1.if can't get current location
  1) as-is
    - API is called like http://210.123.124.139:3001/KORAIL/api/use_station_list?id=dev01&latitude=undefined&longitude=undefined
    - 400 error
  2) to-be
    - return station list regardless of latitude/longitude without error

2.logic (SQL error)
  1) as-is
    - although order station is multiple, return 1 station
  2) to-be
    a) add condition: st_mall.mall_type = 'store'
    b) return station list
      - sort: order count DESC (more order count, show first)
              , order date DESC