6d9bd9915c
When user clicks /start ref_CODE, the referral code was stored only in
FSM state. If the user opened miniapp/cabinet before completing bot
registration, the referral was lost.
Now /start immediately saves pending_referral:{telegram_id} to Redis
(7-day TTL). The referral is consumed by whichever path creates the
user first — bot create_user(), cabinet auth (initdata/widget/oidc).
Redis key is cleared after consumption to prevent double-referral.
- referral_service: save/get/clear_pending_referral Redis helpers
- start.py: save pending referral for new users only
- crud/user.py: create_user checks Redis if no referred_by_id
- cabinet/auth.py: initdata/widget/oidc routes check + cleanup Redis