[Feature Request]: User management mechanism and dialogue window are not perfect

[Jeffyinan]

Is there an existing issue for the same feature request?

• [x] I have checked the existing issues.

Is your feature request related to a problem?

The user management mechanism is not perfect, everyone can register at will, and there is no unified management account.

Switch out during a conversation and click back, there will be no conversation, and you cannot upload pictures and other attachments in the conversation for analysis.

Describe the feature you'd like

1. Add a unified user management function.
2. Increase conversation availability and add the upload attachment function

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response