maintain-clash-scripts

维护此仓库下scripts/目录中的辅助脚本（update_direct_from_cn.py, update_dns.py, update_dns_rules.sh, update_zashboard.sh）。在创建、修改或记录这些脚本时使用，或者当将它们的输出连接到仓库文件或cron任务中时。

Maintain Clash Scripts

Work within scripts/ and keep behavior aligned with OpenClash/Mihomo usage.
Update scripts/README.md whenever a script’s behavior, options, or usage changes.

Preserve update_direct_from_cn.py markers and keep output normalized to IP-CIDR/IP-CIDR6 with ,no-resolve.
Keep update_dns.py output at force_ttl_rules.txt and retain DNS failover + source URL list handling.
Keep update_dns_rules.sh safety checks (download success, non-empty file, header check) and allow user-configurable REMOTE_URL/LOCAL_FILE/RESTART_CMD.
Keep update_zashboard.sh target under /usr/share/openclash/ui/zashboard, OpenWrt-friendly download tooling, and quiet-by-default behavior.

Avoid changing user-specific URLs, paths, or cron schedules unless asked.
Keep shell scripts POSIX sh compatible (busybox ash friendly).
Prefer minimal dependencies and clear configuration blocks at the top of scripts.