.github/pull_request_template.md

## Summary

<!-- Brief description of what this PR does and why -->

## Changes

<!-- List the key changes made -->

-

## Test Plan

- [ ] Backend: `cd backend && uv run pytest tests/ -v`
- [ ] Backend lint: `cd backend && uv run ruff check .`
- [ ] Frontend type check: `cd frontend && pnpm tsc --noEmit`
- [ ] Frontend build: `cd frontend && pnpm build`
- [ ] Manual testing (describe below)

## Screenshots

<!-- If applicable, add screenshots or recordings -->