- add REFERRAL_WELCOME_BONUS_DAYS setting (default 3) in settings.py
- document REFERRAL_WELCOME_BONUS_DAYS in .env.example
- apply welcome bonus on first /start only for newly created users with referred_by_id
- replace hardcoded 3 days with settings.REFERRAL_WELCOME_BONUS_DAYS
- skip bonus flow when value is 0 or less
- send user notification after successful bonus application
- add i18n key referral_welcome_bonus_applied to ru.json and en.json
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