添加HTTP客户端助手、枚举、DTO；更新URL

wanshenmean

2026-02-28 c3de7bb2097aa347a1f92c2f640d18753aff633a

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{
  "RoadwayCommandMapping": {
    "HC": "Formation",
    "GW": "Standard",
    "CW": "Standard"
  },
  "DefaultCommandType": "Standard"
}