GET
/api/auth/me
Current user
POST
/api/auth/register
Register
POST
/api/auth/login
Login
POST
/api/auth/logout
Logout
GET
/api/tasks
List tasks
POST
/api/tasks
Create task
PUT
/api/tasks/:id
Update task
PATCH
/api/tasks/:id/complete
Mark done
DEL
/api/tasks/:id
Delete task
GET
/api/stats/summary
Stats summary
GET
/api/stats/contributions
Heatmap data