refactor(server): replace sync.Map with Sessionizer interface for session management

[flc1125]

Additional question:

Currently, ClientSession is an interface, but when we use implementations like Redis for session management, storage becomes a new issue.

This part requires comprehensive consideration—should we consider changing ClientSession to a struct?

Summary by CodeRabbit

• New Features

  • Introduced an enhanced session management module that streamlines the handling of client sessions and notifications.

• Refactor

  • Updated the underlying session operations to adopt a more modular approach, improving overall reliability and maintainability.

[pirate]

Have you tried telling it to clear the existing text in your prompt?

[justwangqian]

I use default prompt for deepseek-reasoner. There is no relavent instructions and clear text in search box is not an option for agent.

[justwangqian]

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[justwangqian]

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