- Add UserManagementController@store for creating users
- Add POST /api/admin/users endpoint
- Support user types: Free, Pro, Admin
- Auto-create 100-year subscription for Pro/Admin users
- Add user creation modal to Users.jsx
- Complete SaaS limit testing:
- Free user limits: 1 account, 10 categories, 3 budgets, 100 tx
- Middleware blocks correctly at limits
- Error messages are user-friendly
- Usage stats API working correctly
- Update SAAS_STATUS.md with test results
- Bump version to 1.51.0
