Add comprehensive tests for Users API (70 tests total)
Tests include:
- User model validation (22 tests)
- UserGroup, User, UserCreate, UserUpdate models
- Field validation, email validation, password strength
- CamelCase alias support
- Sync UsersEndpoint (24 tests)
- List, get, create, update, delete operations
- Search functionality
- Pagination and filtering
- Error handling and validation
- Data normalization
- Async AsyncUsersEndpoint (24 tests)
- Complete async coverage matching sync API
- All CRUD operations tested
- Validation and error handling
All 70 tests passing. Achieves >95% coverage for Users API code.
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Co-Authored-By: Claude <noreply@anthropic.com>
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