* Code quality pass

* Typofix

* Update applications_controller_spec.rb

* Update applications_controller_spec.rb

If Mastodon accesses to the hidden service via transparent proxy, it's needed to avoid checking whether it's a private address, since `.onion` is resolved to a private address.
I was previously using the `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` to provide that function. However, I realized that using `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` is redundant, since this specification is always used with `ALLOW_ACCESS_TO_HIDDEN_SERVICE`. Therefore, I decided to integrate the setting of `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` into` ALLOW_ACCESS_TO_HIDDEN_SERVICE`.

* User agent for WebFinger

* local_domain → web_domain

* 'http' is away accidentally...

* Add support for HTTP client proxy

* Add access control for darknet

Supress error when access to darknet via transparent proxy

* Fix the codes pointed out

* Lint

* Fix an omission + lint

* any? -> include?

* Change detection method to regexp to avoid test fail