List all users with subscription and activity data

curl --request GET \
  --url https://api.example.com/api/admin/users \
  --header 'Authorization: Bearer <token>'

{
  "users": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email": "<string>",
      "name": "<string>",
      "role": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "activated_at": "2023-11-07T05:31:56Z",
      "onboarding_completed_at": "2023-11-07T05:31:56Z",
      "plan_tier": "<string>",
      "subscription_status": "<string>",
      "trial_ends_at": "2023-11-07T05:31:56Z",
      "current_period_end": "2023-11-07T05:31:56Z",
      "memory_count": 123,
      "last_mcp_request_at": "2023-11-07T05:31:56Z"
    }
  ],
  "total": 123
}