List API keys

{
    "keys": [
        {
            "id": "ak1a2b3c-d4e5-6789-abcd-ef1234567890",
            "name": "CI Pipeline",
            "keyPrefix": "fdm_live_a1b2c3",
            "lastUsedAt": "2026-03-26T14:30:00.000Z",
            "expiresAt": null,
            "isActive": 1,
            "createdAt": "2026-02-01T10:00:00.000Z"
        },
        {
            "id": "ak2b3c4d-e5f6-7890-bcde-f12345678901",
            "name": "External Sync",
            "keyPrefix": "fdm_live_d4e5f6",
            "lastUsedAt": null,
            "expiresAt": "2026-12-31T23:59:59.000Z",
            "isActive": 1,
            "createdAt": "2026-03-15T08:00:00.000Z"
        }
    ]
}