repo: add pull request template

- Add structured summary and change type sections
- Include related issues linking
- Add testing checklist for quality assurance
- Include code quality verification steps
- Add deployment notes section
- Support screenshot attachment for visual changes

Author: Sakeeb91

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,49 @@
+## Summary
+
+<!-- Brief description of changes (1-3 sentences) -->
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation update
+- [ ] CI/CD or infrastructure change
+- [ ] Refactoring (no functional changes)
+
+## Related Issues
+
+<!-- Link to related issues: Fixes #123, Relates to #456 -->
+
+## Changes Made
+
+<!-- Bullet list of specific changes -->
+
+-
+-
+-
+
+## Testing
+
+<!-- Describe how you tested these changes -->
+
+- [ ] Unit tests pass (`pytest tests/unit/`)
+- [ ] Integration tests pass (if applicable)
+- [ ] Manual testing performed
+- [ ] New tests added for new functionality
+
+## Checklist
+
+- [ ] Code follows project style guidelines (`black . && ruff check .`)
+- [ ] Type hints added/updated (`mypy app/ db/ models/`)
+- [ ] Security scan passes (`bandit -c pyproject.toml -r app/ db/ models/`)
+- [ ] Documentation updated (if needed)
+- [ ] CLAUDE.md updated (if architecture changed)
+
+## Deployment Notes
+
+<!-- Any special deployment considerations? Database migrations, environment variables, etc. -->
+
+## Screenshots
+
+<!-- If applicable, add screenshots to demonstrate visual changes -->