interface协议扩充：公告

[overflow65537]

功能描述 / Feature Description

希望interface协议增加一个公告字段

{
  "announcement": [
    {
      "Label": "公告1",
      "path": "公告路径"
    },
    {
      "Label": "公告2",
      "path": "/announcements/2026/notice2"
    },
    {
      "Label": "公告3",
      "path": "/announcements/2026/notice3"
    },
    {
      "Label": "公告4",
      "path": "/announcements/2026/notice4"
    }
  ]
}

label和path均支持i18n

MaaFramework 版本 / Version

No response

其他信息 / Additional Information

No response