広場投稿追加画面の刷新 (#399) (#413)

Reviewed-on: http://git.miteruzo.com/miteruzo/btrc-hub/pulls/413
Co-authored-by: miteruzo <miteruzo@naver.com>
Co-committed-by: miteruzo <miteruzo@naver.com>

backend/config/routes.rb

@@ -52,6 +52,8 @@ Rails.application.routes.draw do
 
   resources :posts, only: [:index, :show, :create, :update] do
     collection do
+      get :metadata
+      post :bulk
       get :random
       get :changes
       get :versions, to: 'post_versions#index'