#4432: docs: update molt.bot links in auto response

## Summary - replace molt.bot URLs in auto-response messages with openclaw.ai links - point support link at the current Discord invite ## Test plan - [ ] N/A (docs/workflow text change) <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the `.github/workflows/auto-response.yml` GitHub Actions workflow to replace legacy `molt.bot` links in label-triggered auto-response messages with the new OpenClaw URLs (`docs.openclaw.ai`) and updates the support server link to a Discord invite. The change is confined to the `rules` array used by the `actions/github-script@v7` step when an `r:*` label is applied to an issue or PR, so it only affects the content posted by the automation (no behavioral/workflow logic changes). <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - Only string literals in a GitHub Actions workflow auto-response message were updated; no workflow triggers, permissions, or API calls changed, so runtime behavior is effectively unchanged aside from the link destinations. - No files require special attention <!-- greptile_other_comments_section --> _{(4/5) You can add custom instructions or style guidelines for the agent [here](https://app.greptile.com/review/github)!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->