1. Admin notification showed "renewal" instead of "first purchase" for new
users because has_had_paid_subscription was set before notification.
All 21 call sites now pass explicit purchase_type.
2. Partner referral not counted when mandatory channel subscription enabled.
required_sub_channel_check saved campaign_id but not referrer_id from
campaign.partner_user_id. Also removed duplicate DB query.
3. BOT_USERNAME auto-detection moved before web server start to close
race window on /cabinet/branding/telegram-widget endpoint.
Fringg
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