build: add unified frontend build script

scripts/build-frontend.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+require_command() {
+  local command_name="$1"
+
+  if ! command -v "${command_name}" >/dev/null 2>&1; then
+    echo "缺少命令：${command_name}" >&2
+    exit 1
+  fi
+}
+
+build_project() {
+  local project_name="$1"
+  local project_dir="$2"
+  local package_manager="$3"
+
+  if [[ ! -f "${project_dir}/package.json" ]]; then
+    echo "未找到 ${project_name} 的 package.json：${project_dir}" >&2
+    exit 1
+  fi
+
+  if [[ ! -d "${project_dir}/node_modules" ]]; then
+    echo "${project_name} 依赖尚未安装，请先在 ${project_dir} 安装依赖。" >&2
+    exit 1
+  fi
+
+  echo
+  echo "开始构建：${project_name}"
+  (
+    cd "${project_dir}"
+    case "${package_manager}" in
+      pnpm)
+        pnpm build
+        ;;
+      npm)
+        npm run build
+        ;;
+      *)
+        echo "不支持的包管理器：${package_manager}" >&2
+        exit 1
+        ;;
+    esac
+  )
+  echo "构建完成：${project_name}"
+}
+
+require_command pnpm
+require_command npm
+
+build_project "平台总后台" "${PROJECT_ROOT}/frontend/platform_admin" pnpm
+build_project "气站管理后台" "${PROJECT_ROOT}/frontend/gas_admin" pnpm
+build_project "配送点管理后台" "${PROJECT_ROOT}/frontend/delivery_admin" pnpm
+build_project "和气门户首页" "${PROJECT_ROOT}/frontend/site" npm
+
+echo
+echo "四个前端项目全部构建完成。"