+ Bonus transaction & order cancellation
+ Spend bonus via API
+ New status for order: DELETED
* Fixed bug with not actual bonus balance returned
* Order bonus can be added in several statuses
* Fixed TG templates a bit
+ Telegram bot: sign up, sign in, notifications
+ Anonymous users can't see yuan_rate_commission
* Only logged in customers can create/update orders
* Customer info migrated to separate User model
* Renamed legacy fields in serializers
* Cleanup in API classes
