初始化兜爸心选 App 官网项目（构建与发布）

- src/：从线上 shop.douba.top/public/app 拉取的页面源码（v0.3.8）
- 版本号、更新日期、安装包大小改为模板变量，统一由 site.config.json 管理，
  安装包大小在构建时从 APK 实际字节数计算
- scripts/build.mjs：构建到 dist/，校验 APK、模板变量与资源引用
- scripts/deploy.mjs：与线上比对差异 → 上传 → 备份 → 原子切换 → 线上验证
- scripts/rollback.mjs、scripts/preview.mjs：回滚与本地预览
- AGENTS.md：项目说明、发版流程与服务器/nginx 约定

由 AI 助手协助完成。

scripts/rollback.mjs

@@ -0,0 +1,27 @@
+// 回滚：把线上目录换回最近一次发布前的备份
+//   node scripts/rollback.mjs          回滚到最近的备份
+//   node scripts/rollback.mjs --list   列出可用备份
+import { spawnSync } from 'node:child_process';
+import { loadConfig } from './build.mjs';
+
+const { host, siteDir, publicUrl } = loadConfig().deploy;
+const live = `${siteDir}/public/app`;
+const backups = `${siteDir}/.deploy/backups`;
+const list = process.argv.includes('--list');
+
+const script = list
+  ? `ls -1d ${backups}/app-* 2>/dev/null | sort -r || echo "（没有备份）"`
+  : `
+    latest=$(ls -1d ${backups}/app-* 2>/dev/null | sort -r | head -1)
+    [ -n "$latest" ] || { echo "没有可回滚的备份" >&2; exit 1; }
+    mv ${live} ${siteDir}/.deploy/rolled-back-$(date +%Y%m%d-%H%M%S)
+    mv "$latest" ${live}
+    echo "已回滚到 $latest"
+  `;
+
+const r = spawnSync('ssh', ['-o', 'BatchMode=yes', host, 'bash -s'], {
+  input: `set -euo pipefail\n${script}`,
+  stdio: ['pipe', 'inherit', 'inherit'],
+});
+if (r.status !== 0) process.exit(r.status ?? 1);
+if (!list) console.log(`请打开 ${publicUrl} 确认。`);