零 Node 部署、超级管理员，并完善本地构建发布文档。

- FastAPI 单进程托管 frontend/dist，systemd 替代 PM2

- 超级管理员 admin、注册开关与用户管理

- README/DEPLOY/USAGE 说明：改代码须本地构建 dist 后 push，服务器 update.sh

- 提交 frontend/dist 与 build-frontend 脚本

deploy/build-frontend.ps1

@@ -0,0 +1,21 @@
+# 本地构建前端并提示提交 dist（开发机执行，服务器不构建）
+$ErrorActionPreference = "Stop"
+$Root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
+Set-Location (Join-Path $Root "frontend")
+
+Write-Host "[INFO] 安装依赖并构建前端…"
+npm ci
+npm run build
+
+if (-not (Test-Path "dist\index.html")) {
+    Write-Error "构建失败：未生成 dist\index.html"
+}
+
+Write-Host ""
+Write-Host "构建完成。请提交并推送："
+Write-Host "  git add frontend/dist"
+Write-Host '  git commit -m "build: update frontend dist"'
+Write-Host "  git push"
+Write-Host ""
+Write-Host "服务器更新："
+Write-Host "  bash /opt/secondary-school-grade-archive/deploy/update.sh"