fix(server): the server restart port should remain unchanged

[btea]

Description

1. Start a project, the default port is 5173.
2. Start another project, because the default port is already in use, so the listening port after the project is started is 5174.
3. Close the first project.
4. At this point, modifying the configuration file of the second project, such as the '.env' file, causes the server to restart. Since the second project may already be in the access state, I think the port that was listening on before should be maintained.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[ArnaudBarre]

I'm also ok with @patak-dev of moving the to the listen part, this maybe better to not update the user config even if it means having a bit more complexity to manage this internal state

[btea]

@ArnaudBarre Already modified as @patak-dev suggested and added the comments you provided. ❤