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fix(tunnel): 修复 Linux cloudflared 权限 - #246
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根因
Linux 上 cloudflared component 由 root/sudo 安装时，component store 的目录和二进制为
0700。Tunnel systemd 服务以非 root service user 运行，导致fork/exec .../cloudflared: permission denied，服务进入自动重启循环。修复
components/cloudflared、版本目录和最终 cloudflared 二进制为0755tunnel start/restart后增加短暂存活确认；服务立即退出时直接报错，不再返回completed:true验证
go test ./... -count=1go vet ./...git diff --check实机日志已确认故障表现为 cloudflared
permission denied且 systemd 连续自动重启。