update 升级@intlify/unplugin-vue-i18n版本依赖

update i18n使用方法。
add 新增i18n vite插件。

src/lang/en_US.json

@@ -0,0 +1,25 @@
+{
+  "route": {
+    "dashboard": "Dashboard",
+    "document": "Document"
+  },
+  "login": {
+    "username": "Username",
+    "password": "Password",
+    "login": "Login",
+    "code": "Verification Code",
+    "copyright": ""
+  },
+  "navbar": {
+    "full": "Full Screen",
+    "language": "Language",
+    "dashboard": "Dashboard",
+    "document": "Document",
+    "message": "Message",
+    "layoutSize": "Layout Size",
+    "selectTenant": "Select Tenant",
+    "layoutSetting": "Layout Setting",
+    "personalCenter": "Personal Center",
+    "logout": "Logout"
+  }
+}