User Story: Add API to Handle Authentication

[lakani]

User Story

As a developer, I want an API endpoint that handles user authentication so that applications using OpenCore can securely verify user identities.

Acceptance Criteria

• An authentication API endpoint is created (e.g., /api/auth/login).
• The endpoint accepts standard credentials (e.g., username/email and password).
• On successful authentication, a secure token (e.g., JWT) is returned.
• On failed authentication, a clear error message is returned.
• The API follows best security practices (e.g., password hashing, rate limiting).
• Proper documentation is provided for request and response formats.

Notes

• Consider extensibility for OAuth or other authentication strategies in the future.
• All sensitive data must be handled according to security best practices.