挂了霉国节点，claude --upgrade 还是更新不了：
PS C:\Users\Administrator> claude --upgrade
Current version: 2.1.117
Checking for updates to latest version...
Error: Failed to install native update
Error: Failed to fetch version from https://downloads.claude.ai/claude-code-releases/latest: ECONNREFUSED
Try running "claude doctor" for diagnostics
PS C:\Users\Administrator> claude doctor
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Diagnostics
├ Currently running: native (2.1.117)
├ Commit: 5e9d59ce46d5
├ Platform: win32-x64
├ Path: C:\Users\Administrator\.local\bin\claude.exe
├ Config install method: native
└ Search: OK (bundled)
Updates
├ Auto-updates: disabled (set by env: CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC)
├ Auto-update channel: latest
└ Version check skipped (essential-traffic-only mode)
Still having issues? Run /feedback to report details.
Press Enter to continue
PS C:\Users\Administrator>
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