توثيق منظومة مدار (Madar Suite)

// 1. Client sends first frame immediately after connection open:
{ "t": "auth", "token": "<access_token>" }

// 2. Server verifies token and replies:
{
  "t": "hello",
  "authenticated": true,
  "user_id": 101,
  "online_ids": [102, 105],
  "active_call": null,
  "ts": 1793939450000
}