// auth_diff.go computes human-readable diffs for auth file field changes.package diff import (	"fmt"	"strings" 	coreauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth") // BuildAuthChangeDetails computes a redacted, human-readable list of auth field changes.// Only prefix, proxy_url, and disabled fields are tracked; sensitive data is never printed.func BuildAuthChangeDetails(oldAuth, newAuth *coreauth.Auth) []string {	changes := make([]string, 0, 3) 	// Handle nil cases by using empty Auth as default	if oldAuth == nil {		oldAuth = &coreauth.Auth{}	}	if newAuth == nil {		return changes	} 	// Compare prefix	oldPrefix := strings.TrimSpace(oldAuth.Prefix)	newPrefix := strings.TrimSpace(newAuth.Prefix)	if oldPrefix != newPrefix {		changes = append(changes, fmt.Sprintf("prefix: %s -> %s", oldPrefix, newPrefix))	} 	// Compare proxy_url (redacted)	oldProxy := strings.TrimSpace(oldAuth.ProxyURL)	newProxy := strings.TrimSpace(newAuth.ProxyURL)	if oldProxy != newProxy {		changes = append(changes, fmt.Sprintf("proxy_url: %s -> %s", formatProxyURL(oldProxy), formatProxyURL(newProxy)))	} 	// Compare disabled	if oldAuth.Disabled != newAuth.Disabled {		changes = append(changes, fmt.Sprintf("disabled: %t -> %t", oldAuth.Disabled, newAuth.Disabled))	} 	return changes}