API Reference: Distributed URL Shortener Engine

Base URL: http://localhost:3000

Method	Endpoint	Auth	Purpose	Status Codes
GET	/:id	No	Resolve short slug and issue 302 redirect	302, 404
POST	/api/create	Optional	Generate short URL (anonymous or user-linked)	200, 400, 409
POST	/api/auth/register	No	Register new user account	201, 400, 409
POST	/api/auth/login	No	Authenticate user & issue httpOnly cookie	200, 401
POST	/api/auth/logout	Yes	Clear auth cookie	200
GET	/api/user/urls	Yes	Retrieve all URLs created by authenticated user	200, 401