API ENDPOINTS:-

API	Description
POST /api/auth/login	Login
POST /api/auth/register	Register
GET /api/problems	List problems
GET /api/problems/:slug	Problem details
POST /api/progress	Mark solved
GET /api/profile	User stats
POST /api/bookmarks	Save problem
POST /api/admin/problem	Add/Edit problem

FRONTEND ARCHITECTURE:-

Route	Purpose
/	Landing page
/login	Auth
/problems	Problem list
/problems/[slug]	Problem details
/profile	User stats
/bookmarks	Saved problems
/admin	Admin dashboard