- Replace rocky8/rocky9/almalinux10 with el8/el9/el10
- Rename Docker build stages: rpm-rocky* → rpm-el*
- Update Makefile to use new directory structure
- Update comments: 'Rocky Linux' → 'Enterprise Linux'
- Simplify Docker volume mount path for RPM output
This makes the naming more generic and aligned with RPM conventions
(el8, el9, el10) rather than specific distribution names.
Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>