feat: 類似度算出バッチ修正，ほか（#228） (#232)

#228

#228

#228

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #232

backend/spec/factories/users.rb

@@ -7,5 +7,9 @@ FactoryBot.define do
     trait :member do
       role { "member" }
     end
+
+    trait :admin do
+      role { 'admin' }
+    end
   end
 end