4eaedd33bf
New boolean setting (default: True) controls whether user traffic is reset when switching between tariff plans. Changes: - config.py: add RESET_TRAFFIC_ON_TARIFF_SWITCH setting - system_settings_service.py: category override (TRAFFIC) + hints - pricing.py: admin bot handler toggle entry - cabinet/routes/subscription.py: pass reset_traffic to RemnaWave on switch - webapi/routes/miniapp.py: same for miniapp tariff switch - tariff_purchase.py: use setting in 3 switch handlers (was hardcoded) - subscription_auto_purchase_service.py: separate tariff switch vs payment logic - crud/subscription.py: conditional traffic_used_gb reset on tariff change