Revert "feat: add dollar-based wallet billing and refactor auth modules (#17)"

This reverts commit 45e1478.

Author: raghavyuva

.env.sample

@@ -48,8 +48,3 @@ DODO_PAYMENTS_WEBHOOK_SECRET=your_webhook_secret_here
 DODO_PAYMENTS_ENVIRONMENT=test_mode
 DODO_PAYMENTS_PRODUCT_ID=pdt.dodo_payments_product_id
 DODO_PAYMENTS_PRODUCT_SLUG=dodo_payments_product_slug
-DODO_CREDITS_PRODUCT_ID=pdt.your_credits_product_id
-DODO_AUTO_TOPUP_PRODUCT_ID=pdt.your_auto_topup_subscription_product_id
-
-# Internal cron secret for machine-to-machine sweep endpoint
-INTERNAL_CRON_SECRET=your_random_secret_here