📋 JSON 格式規範
格式為陣列，每個物件代表一件商品，欄位說明如下：
[
{
"name": "商品名稱（必填）",
"price": 1990,
"origPrice": 2490,
"category": "electronics",
"stock": 50,
"short": "簡短描述（30字內，必填）",
"desc": "完整說明文字",
"imgUrl": "https://example.com/image.jpg",
"bg": "#F1F5F9",
"badges": ["熱銷", "促銷"],
"isNew": false
}
]
category 可用值：electronics / appliances / daily / kitchen / beauty / outdoor / storage / stationery
badges 可用值：熱銷 / 新品 / 促銷（可空陣列 []）
imgUrl / bg / origPrice / desc 為選填，其餘為必填
