KPIs de disparos

GET /v1/broadcasts/kpis

curl "https://api.socialsell.ai/v1/broadcasts/kpis" \
  -H "Authorization: Bearer sk_live_..."

{
  "data": {
    "broadcasts_this_month": 8,
    "messages_sent": 9400,
    "avg_delivery_rate": 0.95,
    "avg_read_rate": 0.62
  }
}