List Gateways

GET /admin/ai-gateway

{
  "gateways": [
    {
      "id": "3f2a1c4e-8b9d-4e7a-9f1c-2d6e5a8b3c10",
      "tenant_id": "9a8b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d",
      "name": "Production",
      "slug": "production",
      "description": null,
      "budget_daily_usd": null,
      "budget_monthly_usd": null,
      "status": "active",
      "paused_reason": null,
      "agent_count": 3,
      "created_at": "2026-05-01T00:00:00Z",
      "updated_at": "2026-05-01T00:00:00Z",
      "created_by": "1b2c3d4e-5f6a-7b8c-9d0e-1f2a3b4c5d6e"
    }
  ],
  "providers": ["anthropic", "openai"]
}