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/internal/vite-config/src/plugins/print.ts

@@ -0,0 +1,28 @@
+import type { PluginOption } from 'vite';
+
+import type { PrintPluginOptions } from '../typing';
+
+import { colors } from '@vben/node-utils';
+
+export const vitePrintPlugin = (
+  options: PrintPluginOptions = {},
+): PluginOption => {
+  const { infoMap = {} } = options;
+
+  return {
+    configureServer(server) {
+      const _printUrls = server.printUrls;
+      server.printUrls = () => {
+        _printUrls();
+
+        for (const [key, value] of Object.entries(infoMap)) {
+          console.log(
+            `  ${colors.green('➜')}  ${colors.bold(key)}: ${colors.cyan(value)}`,
+          );
+        }
+      };
+    },
+    enforce: 'pre',
+    name: 'vite:print-info',
+  };
+};