fix: correct order number gender logic and add null order tests

[bn3t]

• Fix bug where order numbers were inverted for gender: males were getting even numbers and females odd numbers, should be odd for males and even for females
• Add test for generating valid SSIN when order is null
• Add test verifying males get odd order numbers
• Add test verifying females get even order numbers

[Copilot]

Pull request overview

This PR fixes a critical bug in the SSIN (Social Security Identification Number) generator where gender-based order number assignment was inverted. The fix ensures males receive odd order numbers and females receive even order numbers, as required by the SSIN specification.

Changes:

• Corrected the gender logic in generateStringOrderNumber to assign odd numbers to males and even numbers to females
• Added comprehensive test coverage for null order parameter scenarios
• Added specific tests to verify correct gender-based order number generation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/lib/SSINGeneratorHelper.ts	Fixed inverted gender logic: changed condition from Gender.MALE decrement to Gender.FEMALE increment, ensuring males get odd and females get even order numbers
src/lib/SSINGeneratorHelper.test.ts	Added three new tests: validates SSIN generation with null order, verifies males receive odd order numbers, and verifies females receive even order numbers

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