chore(playwright): add AUTH_URL to test env

Aligns with the other 7 examples; .env.example already had it.

Author: mridang

playwright.config.ts

@@ -11,6 +11,7 @@ const testEnv = {
   ZITADEL_CALLBACK_URL: 'http://localhost:3000/api/auth/callback/zitadel',
   ZITADEL_POST_LOGOUT_URL: 'http://localhost:3000/api/auth/logout/callback',
   ZITADEL_POST_LOGIN_URL: '/profile',
+  AUTH_URL: 'http://localhost:3000',
 };
 
 // noinspection JSUnusedGlobalSymbols