[BUG] Claude Installation

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

Autorisierte GitHub-App 'Claude' zeigt 'wurde auf keinem Ihrer Accounts installiert', aber es gibt keinen Install-Button/Link auf der Berechtigungsseite — dadurch bekommt Claude Code keinen Zugriff auf private Repositories."

### What Should Happen?

Claude soll verbunden werden, damit ich repositorys verbinden kann

### Error Messages/Logs

```shell

```

### Steps to Reproduce

Claude Code soll auf Github zugrreifen und bekommt keinen Zugriff

### Claude Model

Sonnet (default)

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

keine Ahnung

### Platform

Anthropic API

### Operating System

Windows

### Terminal/Shell

Windows Terminal

### Additional Information

_No response_

No repository files or tests are named. Start by reproducing the Claude Code GitHub authorization flow on Windows, checking the GitHub App installation and private-repository access steps. Done means the missing installation link or a clear product-side failure is identified and private repositories can be connected.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.