Add analyzeNpmError() to classify npm install failures (permission, network, missing package, locked file, etc.) and return InstallResult with errorCategory, suggestion, and raw npmStderr.
Display targeted troubleshooting steps with colored cause and fix suggestions when csc update fails.
Fix removeInstalledSymlink() to only delete symlinks pointing into our managed ~/.local/share/claude/versions/ directory, preventing accidental removal of user-installed claude binaries from other sources.
Signed-off-by: 林凯90331 <90331@sangfor.com>
Co-authored-by: CoStrict <zgsm@sangfor.com.cn>
c2d5077cf9