fix: cli generate platform issue (#859)

1. 修复生成的平台模板仍然使用 useResourceAlias 配置的 bug
2. 修复生成的 package.json 未格式化的 bug

packages/engine-cli/src/commands/create.js

@@ -46,7 +46,7 @@ export function createPlatform(name, options = {}) {
   const pkgContent = generatePackageJson(name, mergedOptions, templatePath)
 
   fs.outputFileSync(path.resolve(destPath, 'engine.config.js'), configContent)
-  fs.outputJSONSync(path.resolve(destPath, 'package.json'), pkgContent)
+  fs.outputJSONSync(path.resolve(destPath, 'package.json'), pkgContent, { spaces: 2 })
 
   logger.log(
     chalk.green(`create finish, run the follow command to start project: \ncd ${name} && npm install && npm run dev`)

packages/engine-cli/template/designer/vite.config.js

@@ -7,7 +7,6 @@ export default defineConfig((configEnv) => {
     viteConfigEnv: configEnv,
     root: __dirname,
     iconDirs: [path.resolve(__dirname, './node_modules/@opentiny/tiny-engine/assets/')],
-    useSourceAlias: true,
     envDir: './env'
   })