ci: update Node.js requirement and improve code consistency

Updated the README to require Node.js 18+ and added Docker usage instructions. Refactored util/client-sign.js for consistent code style and improved variable naming. Fixed the login_cellphone module to use 'weapi' in createOption. Removed deprecated code from server.js and improved CORS header formatting. Minor fix in util/request.js for user agent selection.

Co-Authored-By: binaryify <[email protected]>

module/login_cellphone.js

@@ -18,7 +18,7 @@ module.exports = async (query, request) => {
   let result = await request(
     `/api/w/login/cellphone`,
     data,
-    createOption(query),
+    createOption(query, 'weapi'),
   )
 
   if (result.body.code === 200) {