refactor: 删除 legacy-client 文件夹

packages/legacy-client/package.json

@@ -1,7 +0,0 @@
-{
-    "name": "@motajs/legacy-client",
-    "dependencies": {
-        "@motajs/legacy-system": "workspace:*",
-        "@motajs/legacy-ui": "workspace:*"
-    }
-}

packages/legacy-client/src/index.ts

@@ -1,2 +0,0 @@
-export * as System from '@motajs/legacy-system';
-export * as UI from '@motajs/legacy-ui';