curl --location --request POST 'http://localhost:6567/api/v1/me/units/11000000-0000-0000-0000-000000000001/complete' \
--header 'Authorization: Bearer <token>'{
"success": true,
"message": "Unit completed successfully",
"unitId": "11000000-0000-0000-0000-000000000001",
"status": "completed",
"xpEarned": 100,
"completedAt": "2026-04-06T16:37:35.761Z"
}