Add GET /api/v2/search which returns rich tag objects, adjust web UI (#7661)

config/routes.rb

@@ -315,6 +315,10 @@ Rails.application.routes.draw do
       end
     end
 
+    namespace :v2 do
+      get '/search', to: 'search#index', as: :search
+    end
+
     namespace :web do
       resource :settings, only: [:update]
       resource :embed, only: [:create]