List categories (paginated)

{
    "data": [
        {
            "id": 42,
            "name": "Engineering",
            "description": "All engineering resources",
            "icon": "folder",
            "color": "#4F46E5",
            "created_at": "2026-01-01T00:00:00Z",
            "updated_at": "2019-08-24T14:15:22.123Z"
        }
    ],
    "meta": {
        "current_page": 1,
        "from": 1,
        "last_page": 5,
        "per_page": 15,
        "to": 15,
        "total": 72
    },
    "links": {
        "first": "http://localhost/api/v1/spaces/7/source-items?page=1",
        "last": "http://localhost/api/v1/spaces/7/source-items?page=5",
        "prev": "string",
        "next": "http://localhost/api/v1/spaces/7/source-items?page=2"
    }
}