List all API keys

{
    "success": true,
    "data": [
        {
            "id": "550e8400-e29b-41d4-a716-446655440000",
            "name": "Production Integration",
            "key_prefix": "elly_abc1234",
            "scopes": [
                "read",
                "write",
                "transactions"
            ],
            "description": "Main ERP integration key",
            "last_used_at": "2025-01-15T10:30:00Z",
            "usage_count": 1523,
            "rate_limit_per_minute": 120,
            "rate_limit_per_day": 50000,
            "is_active": true,
            "expires_at": null,
            "revoked_at": null,
            "created_at": "2025-01-01T00:00:00Z",
            "created_by": "user-uuid-here"
        },
        {
            "id": "660f9500-f30c-52e5-b827-557766551111",
            "name": "Development Testing",
            "key_prefix": "elly_def5678",
            "scopes": [
                "read"
            ],
            "description": "Development environment testing",
            "last_used_at": "2025-01-10T14:20:00Z",
            "usage_count": 45,
            "rate_limit_per_minute": 60,
            "rate_limit_per_day": 10000,
            "is_active": true,
            "expires_at": "2025-12-31T23:59:59Z",
            "revoked_at": null,
            "created_at": "2025-01-05T00:00:00Z",
            "created_by": "user-uuid-here"
        }
    ]
}