Admin - get blog categories (name + slug)

{
    "success": true,
    "message": "Categories fetched successfully",
    "data": {
        "categories": [
            {
                "name": "Astrology",
                "slug": "astrology-predictions"
            },
            {
                "name": "Palmistry",
                "slug": "palmistry-hasta-rekha"
            }
        ]
    }
}