API health check endpoint.

No authentication required.

GET /api/v2/health/
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "status": "healthy",
    "service": "YouTube Transcribes API",
    "version": "v2",
    "timestamp": "2026-06-11T14:00:54.089332Z"
}