fix: 清理 chng_hosts 行末句点，避免 chinadns-ng 启动失败

[SakuraToErii]

问题

ASUSWRT/Merlin 的 DHCP 静态主机条目可能在 /tmp/etc/hosts 中生成以句点结尾的名称，例如：

192.0.2.10 client-host.

FancySS 将该文件复制为 /etc/chng_hosts 后交给 chinadns-ng。当前清洗规则只处理句点后仍有空白字符的情况，遗漏位于行末的句点。chinadns-ng 随后报错并退出：

[local_rr.zig:110 add_ip] invalid domain: 'client-host.'
[opt.zig:552 opt_hosts] failed to load hosts: '/etc/chng_hosts'

启动脚本最终只能观察到 chinadns-ng 进程启动失败。

修复

在现有 hosts 清洗命令中增加 s/\.$//，同时覆盖：

• 句点后有空白字符的主机名
• 位于行末的主机名

验证

• sh -n fancyss/ss/ssconfig.sh 通过
• 测试包含行末句点、同一行多个带句点别名和正常条目的 hosts 文件，输出符合预期
• 手动复现中，原始 hosts 条目稳定触发 chinadns-ng 退出；删除行末句点后，chinadns-ng 完成初始化并持续运行

所有地址、主机名和日志内容均使用通用占位示例。

[Copilot]

🟡 Changes recommended

The edited block still has an internal path inconsistency (/tmp/etc/chng_hosts vs /etc/chng_hosts) that can prevent the cleaned hosts file from being generated/loaded correctly.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates the chinadns-ng startup path to better sanitize hostnames copied from ASUSWRT/Merlin-generated hosts entries, specifically removing a trailing . at end-of-line to prevent chinadns-ng from rejecting invalid domains.

Changes:

• Extend the existing sed cleanup to also strip a trailing dot at end-of-line (s/\.$//) when generating chng_hosts for chinadns-ng.

File summaries

File	Description
fancyss/ss/ssconfig.sh	Adds an extra sed expression to remove end-of-line trailing dots in hosts entries before chinadns-ng loads them.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[SakuraToErii]

@hq450 麻烦有空审阅一下这个小修复。问题可稳定复现：DHCP hosts 条目以句点结尾时，chinadns-ng 会因 invalid domain 退出。当前补丁已统一 chng_hosts 路径并补充行末句点清洗，Shell 语法检查和 hosts 样例测试均已通过。