pixiv: include stacc url in new artist entries (#4028).

app/logical/sources/strategies/pixiv.rb

@@ -109,12 +109,25 @@ module Sources
         nil
       end
 
+      def stacc_url
+        return nil if moniker.blank?
+        "https://www.pixiv.net/stacc/#{moniker}"
+      end
+
+      def profile_urls
+        [profile_url, stacc_url].compact
+      end
+
       def artist_name
         metadata.name
       rescue PixivApiClient::BadIDError
         nil
       end
 
+      def other_names
+        [artist_name, moniker].compact.uniq
+      end
+
       def artist_commentary_title
         metadata.artist_commentary_title
       rescue PixivApiClient::BadIDError