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/apps/web-ele/src/adapter/form.ts

@@ -0,0 +1,41 @@
+import type {
+  VbenFormSchema as FormSchema,
+  VbenFormProps,
+} from '@vben/common-ui';
+
+import type { ComponentType } from './component';
+
+import { setupVbenForm, useVbenForm as useForm, z } from '@vben/common-ui';
+import { $t } from '@vben/locales';
+
+async function initSetupVbenForm() {
+  setupVbenForm<ComponentType>({
+    config: {
+      modelPropNameMap: {
+        Upload: 'fileList',
+        CheckboxGroup: 'model-value',
+      },
+    },
+    defineRules: {
+      required: (value, _params, ctx) => {
+        if (value === undefined || value === null || value.length === 0) {
+          return $t('ui.formRules.required', [ctx.label]);
+        }
+        return true;
+      },
+      selectRequired: (value, _params, ctx) => {
+        if (value === undefined || value === null) {
+          return $t('ui.formRules.selectRequired', [ctx.label]);
+        }
+        return true;
+      },
+    },
+  });
+}
+
+const useVbenForm = useForm<ComponentType>;
+
+export { initSetupVbenForm, useVbenForm, z };
+
+export type VbenFormSchema = FormSchema<ComponentType>;
+export type { VbenFormProps };