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/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "admin-ui",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite --port 3000",
+    "dev:cashier": "vite --port 3000 -- --system=cashier",
+    "dev:super": "vite --port 3000 -- --system=super",
+    "build": "vite build",
+    "build:cashier": "vite build -- --system=cashier",
+    "build:super": "vite build -- --system=super",
+    "build:admin": "vite build -- --system=admin",
+    "build:all": "pnpm build:cashier && pnpm build:super && pnpm build:admin",
+    "type-check": "vue-tsc",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@element-plus/icons-vue": "^2.3",
+    "@iconify-json/tabler": "^1.2.35",
+    "@iconify/vue": "^5.0.1",
+    "axios": "^1.7",
+    "element-plus": "^2.9",
+    "pinia": "^2.2",
+    "vue": "^3.5",
+    "vue-i18n": "^10.0",
+    "vue-router": "^4.4"
+  },
+  "devDependencies": {
+    "@antfu/eslint-config": "^3.11",
+    "@unocss/preset-attributify": "^0.65",
+    "@unocss/preset-icons": "^0.65",
+    "@unocss/preset-uno": "^0.65",
+    "@vitejs/plugin-vue": "^5.2",
+    "@vue/tsconfig": "^0.7",
+    "eslint": "^9.15",
+    "sass": "^1.81",
+    "typescript": "~5.6",
+    "unocss": "^0.65",
+    "unplugin-auto-import": "^0.18",
+    "unplugin-vue-components": "^0.28",
+    "vite": "^6.0",
+    "vue-tsc": "^2.1"
+  }
+}