Add GitHub automation

- CI/CD pipeline with GitHub Actions
- Auto-merge for Dependabot and labeled PRs
- Issue and PR templates
- Dependabot configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

.github/pull_request_template.md

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+## Description
+Brief description of changes.
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+
+## Testing
+- [ ] Tests pass locally
+- [ ] Added new tests
+- [ ] Updated documentation
+
+## Related Issues
+Fixes #
+
+---
+🤖 Generated with [Claude Code](https://claude.com/claude-code)