[Good First Issue] Add unit tests for authentication service

[Dapappa]

Points: 100

Write comprehensive unit tests for the authentication service.

Test Coverage Needed:

• User registration with valid data
• User registration with duplicate email
• Login with correct credentials
• Login with incorrect credentials
• JWT token generation and validation
• Password hashing and verification
• Phone number validation (Nigerian format)

Files to create:

• /packages/database/tests/auth.test.ts

Testing Framework: Jest
Target Coverage: 80%+

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[nagmanijha]

I'd like to work on this!

[Shivam5551]

I'd like to work on this!