📡 Mevcut API Endpoint'leri
GET
/health
Sunucu sağlık kontrolü
GET
/track?ref=REF&utm_source=SOURCE
Click tracking (90 günlük cookie)
POST
/api/submit-lead
Lead gönderimi (form submission)
GET
/api/admin/leads
Admin: Tüm lead'leri getir
POST
/api/admin/update-lead
Admin: Lead onayla/reddet
GET
/api/buyer/stats/:ref
Buyer dashboard (PII yok!)