{"message":"Quiz System API - Yaxshilangan Versiya","version":"3.0","endpoints":{"POST /api/login":"Login","POST /api/register":"Register","GET /api/roles":"Rollar ro'yxati","GET /api/categories":"Kategoriyalar","POST /api/categories":"Kategoriya yaratish","POST /api/questions":"Savollar qo'shish","GET /api/categories/{id}/questions":"Kategoriya savollari","POST /api/check":"Javoblarni tekshirish","POST /api/submit-result":"Telegramga yuborish","GET /api/statistics":"Barcha statistika","GET /api/statistics/{id}":"Kategoriya statistikasi","GET /api/users":"Userlar ro'yxati (super admin)","GET /api/users/{id}":"User tafsilotlari","DELETE /api/users/{id}":"Userni o'chirish","PUT /api/users/{id}/role":"User rolini o'zgartirish"}}