feat(P4): precompute移植+app.js sources双向回填+回归1003/1003+验收体积/文件/data.json

site/details/exceptionvariants.json

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+{"slug":"exceptionvariants","contract":{"variants":["无权限","页面不存在","服务器错误","网关错误（插画）"],"dims":[{"name":"code","values":["403","404","500","502"]},{"name":"display","values":["code","illustration"]}],"unknowns":["状态码字号","插画与状态码的取舍规则"],"anatomy":{"code":"大号状态码或插画","text":"标题、描述","actions":"返回首页、重试按钮"},"doNot":["插画素材本身","错误日志上报"],"usage":["403、404、500、502","大号状态码或插画","标题、描述","返回首页、重试按钮","适用于错误处理"],"structure":{"codes":"403 / 404 / 500 / 502","actions":"返回首页 + 重试"}},"specLines":["- 403、404、500、502","- 大号状态码或插画","- 标题、描述","- 返回首页、重试按钮","- 适用于错误处理"]}