Skip link report issue when issues are disabled

[krMaynard]

Summary

• skip scheduled link-report issue creation when repository Issues are disabled
• preserve the current broken-link report behavior for repositories where Issues are enabled

Root cause

The scheduled link check deliberately runs Lychee with fail: false and then creates an issue when broken links are found. Forks can have Issues disabled; in that case peter-evans/create-issue-from-file fails the otherwise successful reporting workflow with Issues has been disabled in this repository.

The workflow event already exposes the repository's has_issues setting, so the issue step can be gated without suppressing the link report or changing upstream behavior.

Validation

• parsed .github/workflows/link-check.yml successfully as YAML
• git diff --check passes
• confirmed has_issues: false on the reproducing fork and has_issues: true upstream