feat: Client on port 4000 and API on 4001

[jonas-martinez]

Closes https://github.com/lenra-io/devtool/issues/184

Description of the changes

Checklist

• [x] I didn't over-scope my PR
• [x] My PR title matches the commit convention
• [ ] I did not include breaking changes
• [x] I made my own code-review before requesting one

I included unit tests that cover my changes

• [ ] 👍 yes
• [x] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

I added/updated the documentation about my changes

• [ ] 📜 README.md
• [ ] 📕 docs/*.md
• [ ] 📓 docs.lenra.io
• [x] 🙅 no documentation needed

Technical highlight/advice

[jonas-martinez]

Please check your Flutter version. It seems that the dependencies have been downgraded.

I upgraded to the latest flutter version, this seems better, only mockito went from 5.4.1 to 5.4.0, this may be normal and this won't cause any problem anyway.

[shiipou]

:tada: This PR is included in version 1.0.0-alpha.5 :tada:

The release is available on:

• GitHub release
• v1.0.0-alpha.5

Your semantic-release bot :package::rocket: