refactor: migrate ESLint configuration to flat config and remove redundant rule files

- replace legacy .eslintrc files with flat eslint.config.js
- consolidate eslint globals for improved code clarity
- enable prefer-const and no-unused-vars off in *.js for flexibility
- remove unused import statements and redundant eslint directives from epic-games.js and aliexpress.js
- standardize function parameter syntax to arrow with parentheses omitted where safe
- add comments marking unused but retained functions for reference

aliexpress.js

@@ -71,7 +71,7 @@ const urls = {
   merge: 'https://m.aliexpress.com/p/merge-market/index.html',
 };
 
-/* eslint-disable no-unused-vars */
+
 const coins = async () => {
   await Promise.any([page.locator('.checkin-button').click(), page.locator('.addcoin').waitFor()]);
   console.log('Coins:', await page.locator('.mycoin-content-right-money').innerText());
@@ -94,7 +94,7 @@ const euro = async () => {
 const merge = async () => {
   await page.pause();
 };
-/* eslint-enable no-unused-vars */
+
 
 try {
   await [