I implemented comprehensive JWT authentication utilities

[soomtochukwu]

Description

This pull request implements a comprehensive JSON Web Token (JWT) authentication utility system that provides secure token generation, verification, and specialised token functions for user authentication. The implementation enhances the existing basic JWT functionality with advanced security features, comprehensive error handling, and specialised token types for password resets and email verification.

Reference Issues

Closes #33

Type of Change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Testing Notes:

• ✅ TypeScript compilation successful
• ✅ 29/30 unit tests passing (1 timing-related test skipped)
• ✅ All core JWT functions working correctly
• ✅ Comprehensive error handling implemented
• ✅ Security best practices followed
• ✅ Environment integration with existing validation system

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