curl -X GET https://api.thinnest.ai/v2/chats \
  -H "Authorization: Bearer $THINNESTAI_API_KEY"

{
  "chats": [
    {
      "id": "sess_abc123",
      "agent_id": 5,
      "name": "Sales inquiry",
      "source": "dashboard",
      "message_count": 12,
      "created_at": "2026-03-25T10:00:00Z",
      "updated_at": "2026-03-25T10:15:00Z"
    }
  ],
  "total": 1
}