- docs: fix email address format to receipts+<token>@receipts.cartsnitch.com
(per Settings → Receipt Email UI, not the old farh.net domain format)
- docs: fix UI section label from 'Account' to 'Receipt Email'
- scripts/seed-env.sh: fix --env flag parser when called as './seed-env.sh --env uat'
positional form was already correct; flag form was consuming --env as ENV value
Co-Authored-By: Paperclip <noreply@paperclip.ing>