* docs: simplify all crates README files
- Remove extensive code examples and detailed documentation
- Convert to minimal module introductions with core feature lists
- Direct users to main RustFS repository for comprehensive docs
- Updated 20 crate README files for consistency and brevity
Files updated:
- crates/rio/README.md (415→15 lines)
- crates/s3select-api/README.md (592→15 lines)
- crates/s3select-query/README.md (658→15 lines)
- crates/signer/README.md (407→15 lines)
- crates/utils/README.md (395→15 lines)
- crates/workers/README.md (463→15 lines)
- crates/zip/README.md (408→15 lines)
* docs: restore original headers in crates README files
- Add back RustFS logo image and CI badges
- Restore formatted headers and structured layout
- Keep simplified content with module introductions
- Maintain consistent documentation structure across all crates
All 20 crate README files now have proper headers while keeping
the simplified content that directs users to the main repository.
* rules: enforce PR-only workflow for main branch
- Strengthen rule that ALL changes must go through pull requests
- Explicitly forbid direct commits to main branch under any circumstances
- Add comprehensive PR requirements and enforcement guidelines
- Clarify that PRs are the ONLY way to merge to main branch
- Add requirement for PR approval before merging
- Include enforcement mechanisms for branch protection
