Update the standard image element to <img>

[Lipraty]

Sources

Others

Describe the problem related to the feature request

See: https://github.com/koishijs/koishi/releases/tag/4.16.4

satori: 对协议实现进行了一些调整：
移除了已过时的 encoder.guildId 用法 (satorijs/satori#216) (satorijs/satori@ac103f1)
修改了与标准元素不符的实现，将 替换为 ， 属性替换为 (satorijs/satori#198) (satorijs/satori#217) (satorijs/satori#223) (satorijs/satori@014583e) (koishijs/webui@765a7f9)

Describe the solution you'd like

Describe alternatives you've considered

Additional context