curl --request GET \
  --url https://app.autoposting.ai/api-proxy/agents/{agentId}/stats \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "agentId": "agent_01HXYZ",
    "totalRuns": 30,
    "successfulRuns": 28,
    "failedRuns": 2,
    "totalPostsGenerated": 28,
    "totalPostsPublished": 24,
    "averageRunDurationMs": 38000
  }
}