refactor: 重命名 customer-mobile 为 cashier-customer

统一收银相关项目命名：
- cashier-mobile: 收银端（店员使用）
- cashier-customer: 顾客端（顾客使用）

更新所有相关配置和引用

cashier-customer/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "cashier-customer",
+  "version": "1.0.0",
+  "description": "顾客端移动端 - uni-app",
+  "main": "main.js",
+  "scripts": {
+    "dev:h5": "uni",
+    "dev:mp-weixin": "uni --platform mp-weixin",
+    "dev:app": "uni --platform app",
+    "build:h5": "uni build",
+    "build:mp-weixin": "uni build --platform mp-weixin",
+    "build:app": "uni build --platform app"
+  },
+  "dependencies": {
+    "@dcloudio/uni-app": "3.0.0",
+    "vue": "^3.3.0",
+    "vuex": "^4.1.0"
+  },
+  "devDependencies": {
+    "@dcloudio/types": "^3.3.0",
+    "@dcloudio/uni-cli-shared": "3.0.0",
+    "@dcloudio/vite-plugin-uni": "3.0.0",
+    "vite": "^4.4.0"
+  }
+}