refactor(anti-spam): make anti-spam agnostic from Akismet

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/resolvers/user.ex

@@ -8,7 +8,7 @@ defmodule Mobilizon.GraphQL.Resolvers.User do
   alias Mobilizon.{Actors, Admin, Config, Events, FollowedGroupActivity, Users}
   alias Mobilizon.Actors.Actor
   alias Mobilizon.Federation.ActivityPub.Actions
-  alias Mobilizon.Service.Akismet
+  alias Mobilizon.Service.AntiSpam
   alias Mobilizon.Service.Auth.Authenticator
   alias Mobilizon.Storage.{Page, Repo}
   alias Mobilizon.Users.{Setting, User}
@@ -161,8 +161,8 @@ defmodule Mobilizon.GraphQL.Resolvers.User do
     with {:ok, email} <- lowercase_domain(email),
          :registration_ok <- check_registration_config(email),
          :not_deny_listed <- check_registration_denylist(email),
-         {:akismet, :ham} <-
-           {:akismet, Akismet.check_user(email, current_ip, user_agent)},
+         {:spam, :ham} <-
+           {:spam, AntiSpam.service().check_user(email, current_ip, user_agent)},
          {:ok, %User{} = user} <-
            args
            |> Map.merge(%{email: email, current_sign_in_ip: current_ip, current_sign_in_at: now})
@@ -186,7 +186,7 @@ defmodule Mobilizon.GraphQL.Resolvers.User do
            "Your e-mail has been denied registration or uses a disallowed e-mail provider"
          )}
 
-      {:akismet, _} ->
+      {:spam, _} ->
         {:error,
          dgettext(
            "errors",