Get authenticated account summary

{
    "accountId": "acct_01HXAMPLE",
    "userId": "api_key_key_01HXAMPLE",
    "authType": "api_key",
    "scopes": [
        "jobs:read",
        "jobs:write"
    ],
    "account": {
        "id": "acct_01HXAMPLE",
        "name": "Example Media",
        "slug": "example-media",
        "plan": "growth",
        "status": "active",
        "createdAt": "2026-05-01T10:00:00.000Z"
    },
    "credits": {
        "balance": 1200,
        "currency": "credits"
    },
    "workspaces": [
        {
            "id": "acct_01HXAMPLE",
            "name": "Example Media",
            "slug": "example-media",
            "status": "active"
        }
    ],
    "projects": [
        {
            "id": "proj_01HXAMPLE",
            "name": "Example Daily Brief",
            "slug": "daily-brief"
        }
    ]
}