feat: 初始化HEFA-L2 PDI管理系统项目

添加前端Vue2项目结构，包括ElementUI集成、路由配置和API模块
实现后端FastAPI服务，包含Oracle数据库连接和PDI CRUD接口
添加OPC-UA轮询服务，支持跟踪图数据同步到Oracle
提供SQLite镜像数据库用于本地开发和快速查询
包含完整的部署脚本和文档说明

frontend/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "hefa-l2-frontend",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "serve": "vue-cli-service serve",
+    "build": "vue-cli-service build"
+  },
+  "dependencies": {
+    "axios": "^1.6.8",
+    "element-ui": "^2.15.14",
+    "vue": "^2.7.16",
+    "vue-router": "^3.6.5"
+  },
+  "devDependencies": {
+    "@vue/cli-service": "^5.0.8",
+    "vue-template-compiler": "^2.7.16"
+  }
+}