chore: 初始化前端仓库并迁移 admin-ui

- 创建 rui-frontend 前端仓库
- 迁移 admin-ui 管理后台
- 创建 cashier-mobile 和 customer-mobile 占位项目
- 配置 pnpm workspace

admin-ui/build-config/cashier.json

@@ -0,0 +1,20 @@
+{
+  "key": "cashier",
+  "name": "收银系统",
+  "description": "面向收银场景的管理后台",
+  "modules": ["system", "user", "cms", "cashier"],
+  "login": {
+    "component": "Cashier",
+    "showTenantInput": true,
+    "title": "睿核收银",
+    "subtitle": "门店管理系统"
+  },
+  "dashboard": {
+    "component": "Cashier",
+    "title": "收银数据概览"
+  },
+  "theme": {
+    "primaryColor": "#1677ff",
+    "title": "睿核收银"
+  }
+}

admin-ui/build-config/default.json

@@ -0,0 +1,20 @@
+{
+  "key": "default",
+  "name": "默认系统",
+  "description": "开发测试用，包含所有模块",
+  "modules": ["system", "user", "order", "cms", "marketing", "demo", "cashier"],
+  "login": {
+    "component": "Default",
+    "showTenantInput": true,
+    "title": "睿核通用平台",
+    "subtitle": "管理后台登录"
+  },
+  "dashboard": {
+    "component": "Default",
+    "title": "数据概览"
+  },
+  "theme": {
+    "primaryColor": "#1677ff",
+    "title": "睿核通用平台"
+  }
+}

admin-ui/build-config/super.json

@@ -0,0 +1,20 @@
+{
+  "key": "super",
+  "name": "超级管理后台",
+  "description": "超级租户专用，包含租户管理",
+  "modules": ["system", "user"],
+  "login": {
+    "component": "Super",
+    "showTenantInput": false,
+    "title": "睿核平台管理",
+    "subtitle": "超级管理员登录"
+  },
+  "dashboard": {
+    "component": "Super",
+    "title": "平台运营概览"
+  },
+  "theme": {
+    "primaryColor": "#722ed1",
+    "title": "睿核平台管理"
+  }
+}