chore: 第六组工程化统一

- Dockerfile: node:18-slim 升级 node:20-slim（LTS，better-sqlite3 有预编译二进制）
- engines 统一 node >=20.19.0（对齐 Vite 8 要求，前后端一致）
- backend 新增 npm test（node --test，自动发现 test/ 目录）
- 新增 .github/workflows/ci.yml：后端 npm test + 前端 build
- 提交 frontend/package-lock.json，CI 依赖缓存生效

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  backend-test:
+    name: Backend tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: backend/package-lock.json
+      - run: npm install --registry=https://registry.npmmirror.com
+      - run: npm test
+
+  frontend-build:
+    name: Frontend build
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+      - run: npm install --registry=https://registry.npmmirror.com
+      - run: npm run build

Dockerfile

@@ -1,5 +1,5 @@
-# 本地已构建好 frontend/dist，镜像内无需 pnpm/corepack/构建工具链
-FROM --platform=linux/amd64 node:18-slim
+# 本地已构建好 frontend/dist，镜像内无需构建工具链
+FROM --platform=linux/amd64 node:20-slim
 ENV NODE_ENV=production \
     PORT=3000 \
     DATA_DIR=/app/data \
@@ -7,7 +7,7 @@ ENV NODE_ENV=production \
 
 WORKDIR /app
 
-# 后端依赖：仅 express + better-sqlite3（node:18 有预编译二进制）
+# 后端依赖：仅 express + better-sqlite3（node:20 有预编译二进制）
 COPY backend/package.json ./
 RUN npm install --production
 

backend/package.json

@@ -4,12 +4,13 @@
   "private": true,
   "type": "module",
   "main": "server.js",
-  "scripts": {
+"scripts": {
     "start": "node server.js",
-    "dev": "node --watch server.js"
+    "dev": "node --watch server.js",
+    "test": "node --test"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20.19.0"
   },
   "dependencies": {
     "better-sqlite3": "^11.10.0",

frontend/package.json

@@ -2,7 +2,10 @@
   "name": "frontend",
   "private": true,
   "version": "0.0.0",
-  "type": "module",
+"type": "module",
+  "engines": {
+    "node": ">=20.19.0"
+  },
   "scripts": {
     "dev": "vite",
     "build": "vite build",