Allocation-client subpage

[DO NOT MERGE] only for review
we cannot guarantee, that dummy pricing object will exist for this service. try sth like that:
```
try:
    service_env = service_obj.environments_services.all()[:1].get()
except ServiceEnvironment.DoesNotExist:
    raise SomeHTTPException()
else:
    daily_pricing_object = service_env.dummy_pricing_object.get_daily_pricing_object(first_day)
```
(calling property `dummy_pricing_object` on `service_env` will create dummy_pricing_object if not exist)