fix: add WordPress 7 compatibility and Plugin Check fixes

[mariusglauer]

Summary

• Updates the plugin metadata/readme for WordPress 7.0 compatibility and version 1.4.9.
• Adds direct-access guards to PHP plugin files flagged by Plugin Check.
• Rewrites the public readme/plugin description in English for WordPress.org checks.
• Runs Plugin Check against a packaged build/funnelcockpit directory so the slug/text domain match the WordPress.org plugin and repo-only files such as deploy/ are excluded.
• Grants the Plugin Check job PR/issue comment permissions so failed checks can post the PR comment.

Validation

• git diff --check
• node --check for tracked JavaScript files
• Local package layout smoke check in /private/tmp/funnelcockpit-package/funnelcockpit
• GitHub Actions will run on the updated PR branch.

[github-actions]

✅ WordPress Plugin Check Report

✅ Status: Passed

📊 Report

All checks passed! No errors or warnings found.

---

🤖 Generated by WordPress Plugin Check Action • Learn more about Plugin Check