demo/site.json是模板的演示数据包，让新模板在不改线上数据的前提下用一套语义匹配的内容验收效果。

数据结构

{
  "title": "示例企业官网·演示数据",
  "theme": "蓝色科技风",
  "config": { "ex_brand": "示例科技" },
  "tables": {
    "category": [{ "id":1, "pid":0, "name":"公司新闻", "sort":100, "show_nav":1 }],
    "article": [{ "id":1, "cat_id":1, "title":"示例文章", "content":"
正文
",
                   "status":1, "hits":1200, "_days_ago":1 }],
    "page": [{ "title":"关于我们", "alias":"about", "content":"
...
" }],
    "banner": [{ "title":"首页大图", "image":"{demo_uploads}/banner1.jpg", "sort":100, "status":1 }],
    "link": [{ "name":"造梦开放平台", "url":"https://open.zaomengkaifang.com", "sort":40 }]
  }
}

• tables的键为表名可省略表前缀
• 行对象不在该表列中的字段自动忽略
• _days_ago特殊键写入相对当前时间N天前
• {demo_uploads}替换为uploads/demo/{slug}/