feat: 添加完整的前端管理系统 (VbenAdmin)

- 添加基于 VbenAdmin + Vue3 + Element Plus 的前端管理系统
- 包含完整的 UI 组件库和工具链
- 支持多应用架构 (web-ele, backend-mock, playground)
- 包含完整的开发规范和配置
- 修复 admin 目录的子模块问题，确保正确提交

admin/scripts/turbo-run/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "@vben/turbo-run",
+  "version": "5.5.9",
+  "private": true,
+  "license": "MIT",
+  "type": "module",
+  "scripts": {
+    "stub": "pnpm unbuild --stub"
+  },
+  "files": [
+    "dist"
+  ],
+  "bin": {
+    "turbo-run": "./bin/turbo-run.mjs"
+  },
+  "main": "./dist/index.mjs",
+  "module": "./dist/index.mjs",
+  "exports": {
+    ".": {
+      "default": "./dist/index.mjs"
+    },
+    "./package.json": "./package.json"
+  },
+  "dependencies": {
+    "@clack/prompts": "catalog:",
+    "@vben/node-utils": "workspace:*",
+    "cac": "catalog:"
+  }
+}