ci: add backport workflow for version-15 branch

[harshtandiya]

Summary

• Adds GitHub Actions workflow using korthout/backport-action
• When PR merged to develop with backport/version-15 label, auto-creates backport PR targeting version-15
• Label backport/version-15 already created on repo

Usage

1. Add backport/version-15 label to any PR (before or after merge)
2. On merge → action cherry-picks and creates new PR to version-15
3. If conflicts → creates draft PR with manual resolution instructions

Test plan

• Merge this PR with backport/version-15 label
• Verify backport PR auto-created to version-15

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fd050035-c6f0-46eb-999a-e6d885ba6d8b

📥 Commits

Reviewing files that changed from the base of the PR and between d5cde23 and 7b9055c.

📒 Files selected for processing (1)

• .github/workflows/backport.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/backport-workflow

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