* docs: add CI/CD integration section and examples
- Add CI/CD Integration section to README.md and README.zh-CN.md
- Add GitHub Actions workflow example (examples/github_actions/)
- Add GitLab CI pipeline example (examples/gitlab_ci/)
- Add examples README with overview of integration options
* feat(examples): enhance GitHub Actions demo with comment trigger and improved error handling
- Add issue_comment event trigger with /open-code-review and @open-code-review keywords
- Add PR context resolution for comment-triggered events via GitHub API
- Improve ref handling to support both PR events and comment events
- Add individual comment fallback with retry when batch review fails
- Add posting statistics (success/failed counts) to summary comment
- Update README with comment trigger flow and customization guide
* docs(examples): add --background flag usage guide for GitHub Actions and GitLab CI
Explain how to pass PR/MR title as background context to help OCR
provide more relevant and context-aware review comments.
* feat(examples): simplify PR trigger and add skip-existing-review guide for GitLab CI
- Reduce GitHub Actions PR trigger to 'opened' only (avoid redundant
reviews on synchronize/reopened events)
- Add GitLab CI documentation for checking existing OCR comments before
running review to save LLM tokens
