fix: create gh repo in Initialization that the rest of the application expects

[Heinrich-XIAO]

What Changed

Initialize Git created only a local repo, so push/PR was broken until you manually created a GitHub repo and origin.

Why

This fix is right because it makes the button create the complete state the app already assumes (local repo plus GitHub remote)

UI Changes

N/A

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes (N/A)
• I included a video for animation/interaction changes (N/A)

Note

Create a private GitHub repo automatically during git init

• The WS_METHODS.gitInit websocket handler in wsServer.ts now calls gitHubCli.createRepository with visibility: 'private' after git.initRepo, tying the response to the repository creation result.
• Adds createRepository to the GitHubCli service interface and layer, invoking gh repo create --source=. --private --remote origin.
• GitHubCliLive is added to the top-level layer in serverLayers.ts so it is available across the server runtime.
• Behavioral Change: gitInit now fails if gh repo create fails, and a private GitHub remote repo is always created on every local repo init.

^{Macroscope summarized ec79ce1.}

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[Noojuno]

I don't think I would want this app making repos for me automatically tbh, I think the functionality might be worth adding as a popup that is triggered via the Git dropdown if no remote works but it's a little more complicated than just making a private repo by default and calling it a day.

For example, if I'm using T3 Code for a work project, I need to make the repo under the org for my work rather than my personal account, and they also need to have the --internal flag added