- Add constraint-management feature to features.json
- Create /api/admin/constraints endpoint (GET, POST, DELETE)
- Support UNIQUE and CHECK constraints
- Add getConstraintTypes() utility function
- Add integration tests for constraints API
- Add unit tests for constraint types
- Follow CODE_STYLE.md guidelines
Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>