fix: package.json添加dependencies, 修复新机器npm install空跑问题

- package.json: 声明 vue/element-plus/marked/vite 等依赖
- setup.sh/start.sh: 用 npm run build 替代 npx vite build
- start.sh: 构建前自动 npm install --include=dev
- 重新生成 package-lock.json

start.sh

@@ -33,11 +33,11 @@ fi
 
 # 检查前端构建
 if [ ! -f "frontend/dist/index.html" ]; then
-    if command -v npx &>/dev/null; then
+    if command -v npm &>/dev/null; then
         echo "📦 构建前端..."
-        cd frontend && npx vite build && cd ..
+        cd frontend && npm install --include=dev && npm run build && cd ..
     else
-        echo "❌ 前端未构建且 npx 不可用，请先运行: ./setup.sh"
+        echo "❌ 前端未构建且 npm 不可用，请先运行: ./setup.sh"
         exit 1
     fi
 fi