refactor(clickTtPlayerRegistrationService): update debug HTML file path generation

- Modified the buildDebugHtmlPath function to use path.join for constructing the file path, ensuring compatibility across different operating systems.
- This change enhances the maintainability of the code by standardizing file path handling.

backend/services/clickTtPlayerRegistrationService.js

@@ -1,5 +1,6 @@
 import { chromium } from 'playwright';
 import { writeFile } from 'fs/promises';
+import path from 'path';
 import Member from '../models/Member.js';
 import Club from '../models/Club.js';
 import ClickTtAccount from '../models/ClickTtAccount.js';
@@ -38,7 +39,7 @@ function escapeRegExp(value) {
 
 function buildDebugHtmlPath() {
   const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
-  return `/tmp/clicktt-debug-${timestamp}.html`;
+  return path.join(process.cwd(), 'backend', 'tmp', `clicktt-debug-${timestamp}.html`);
 }
 
 class ClickTtPlayerRegistrationService {