ci: Add docs notification workflow on release

[jayden-lee-sb]

Summary

• Add a GitHub Actions workflow that automatically notifies the sendbird-docs repository whenever a new SDK release is published.
• On each release event, this workflow triggers a repository_dispatch to sendbird-docs, passing the SDK type, release tag, and release URL so that documentation can be updated accordingly.

Test plan

• Verify the workflow file is correctly placed at .github/workflows/notify-docs-update.yml
• Confirm the SDK_TYPE env variable matches this repository
• Publish a test release and verify the docs repo receives the dispatch event

[netlify]

✅ Deploy Preview for sendbird-uikit-react ready!

Name	Link
🔨 Latest commit	d361de8
🔍 Latest deploy log	https://app.netlify.com/projects/sendbird-uikit-react/deploys/698c0ab043a93200088fb136
😎 Deploy Preview	https://deploy-preview-1404--sendbird-uikit-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.