fix: convert shell scripts to LF line endings for Linux

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitattributes

@@ -0,0 +1,7 @@
+# Shell scripts must use LF on Linux
+*.sh text eol=lf
+.env text eol=lf
+.env.example text eol=lf
+
+# Default: normalize text files
+* text=auto

docs/DEPLOY.md

@@ -144,6 +144,7 @@ systemctl restart sing-box
 
 | 问题 | 处理 |
 |------|------|
+| `set: pipefail: invalid option` | Windows 换行符问题，执行：`sed -i 's/\r$//' scripts/*.sh .env` 后重试 |
 | `dig` 未返回正确 IP | 等待 DNS 生效或检查解析记录 |
 | acme 证书失败 | 确认 80 端口可访问：`curl -I http://66.hyf2.cc` |
 | sing-box 启动失败 | `journalctl -u sing-box -n 50` 查看报错 |