feat: integrate AuraPay payment provider

Full integration following PayPear/RollyPay patterns:
- API client with X-ApiKey + X-ShopId auth, HMAC-SHA256 webhook verification
  (sorted keys, concatenated values, secret key #2)
- AuraPayPaymentMixin with create, webhook, finalize (all side effects), status check
- CRUD, model, migration (0060), PaymentMethod.AURAPAY enum
- Webhook endpoint, cabinet topup, bot handler with sub-options (card, sbp)
- Admin panel: AURAPAY category in bot_configuration + system_settings_service
- Config: AURAPAY_ENABLED, AURAPAY_API_KEY, AURAPAY_SHOP_ID, AURAPAY_SECRET_KEY

.env.example

@@ -730,6 +730,24 @@ ROLLYPAY_WEBHOOK_PATH=/rollypay-webhook
 # URL возврата после оплаты
 # ROLLYPAY_RETURN_URL=
 
+# ===== AURAPAY (aurapay.tech) =====
+AURAPAY_ENABLED=false
+# API ключ (X-ApiKey header)
+AURAPAY_API_KEY=
+# UUID магазина (X-ShopId header)
+AURAPAY_SHOP_ID=
+# Секретный ключ #2 для HMAC-SHA256 верификации вебхуков
+AURAPAY_SECRET_KEY=
+AURAPAY_DISPLAY_NAME=AuraPay
+AURAPAY_CURRENCY=RUB
+AURAPAY_MIN_AMOUNT_KOPEKS=10000
+AURAPAY_MAX_AMOUNT_KOPEKS=10000000
+AURAPAY_WEBHOOK_PATH=/aurapay-webhook
+# URL возврата после оплаты
+# AURAPAY_RETURN_URL=
+# Время жизни инвойса в минутах
+AURAPAY_PAYMENT_LIFETIME_MINUTES=60
+
 # ===== WATA =====
 WATA_ENABLED=false
 WATA_BASE_URL=https://api.wata.pro