fix(site): CSS/JS 内容 hash 版本号，根治边缘缓存样式不更新 - #66
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问题：styles.css/app.js 设了 max-age=86400，Cloudflare 边缘缓存旧版， 部署 CSS 改动后用户仍看到旧样式（详情页排版修复一度不可见）。 修复：HTML 引用改为 styles.css?v=<hash> / app.js?v=<hash>，hash 取文件 内容 sha256 前 10 位。内容变→URL 变→边缘按新 key 取新文件（立即生效）； 内容不变→URL 不变→继续命中长缓存。HTML 本身 max-age=0 始终新鲜， 保证总是引用到最新版本号。 验证：重建 42 页，首页与详情页 CSS/JS 引用均带 ?v=hash。
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styles.css/app.js 加 ?v=<内容hash>，部署 CSS 改动后立即生效，绕过 Cloudflare max-age=86400 边缘缓存。