Ask questions about authentication: how to integrate third-party authentication to facilitate docking with existing users

This answer is very easy to use and neat; want to organize and use the existing business system, but it is troublesome to let users re-register. In order to better interact with users, it is necessary to increase users' third-party authentication, such as QQ and Wechat.

该 issue 没有指出任何文件、测试或入口点。首先明确所需的 QQ 和 WeChat 身份验证流程、现有用户应如何匹配，以及应由 plugin 的哪个扩展点负责集成。完成标准应包括一个已达成共识的范围，以及一条支持第三方登录的实现路径，同时无需强迫现有用户重新注册。

由索引模型根据 Issue 内容生成。