fix: use install.sh script to configure pnpm build dependencies

backend/install.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+corepack enable
+
+# 设置 pnpm 允许运行 postinstall 脚本的包
+pnpm config set onlyBuiltDependencies "@prisma/client @prisma/engines esbuild prisma"
+
+# 安装依赖
+pnpm install --frozen-lockfile