[arch] 多次 chsrc set arch 后 mirrorlist 累积旧 Server 行，upstream 官方源地址无效
@yayoinoyume is already working on this.
Since Sep 7, 2026.
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Description
问题描述
1. Arch的换源操作不是幂等
chsrc set arch <源> 每次都会向 /etc/pacman.d/mirrorlist 追加(prepend)新的 Server 行，但从不清理旧行。多次换源后 mirrorlist 会累积所有历史源，例如：
chsrc set arch tuna→ mirrorlist 写入 tuna 行chsrc set arch ali→ mirrorlist 写入 ali 行（tuna 行仍在）chsrc set arch tencent→ mirrorlist 写入 tencent 行（tuna、ali 行仍在）
结果：mirrorlist 中出现多行 Server，且最先命中的可能是旧源（行为不可预期）；累积行数随换源次数线性增长，文件越来越脏。这不是幂等操作，重复执行同一操作结果不同。
修复：实现换源的幂等操作，仅对 x86_64 有效。
2. 官方源地址 https://repo.archlinux.org 实际不存在
arch dish 的 UpstreamProvider（即 chsrc set arch upstream）地址为 https://repo.archlinux.org，但该域名不存在：
- 本机
curl -I https://repo.archlinux.org提示curl: (6) Could not resolve host: repo.archlinux.org。 - 在线DNS检测，这个地址没有任何A记录
- Arch 官方全局 mirrorlist 中无此条目。
- 官方推荐入口是
geo.mirror.pkgbuild.com（按地理位置自动选最近镜像）/fastly.mirror.pkgbuild.com
因此任何用户执行 chsrc set arch upstream ，会报 致命错误，且chsrc reset arch不可用，提示 暂未实现reset。
关联
已尝试实现修复并实测验证，具体见关联 PR #394
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