Revert "feat: D & D による上位タグ設定（#184） (#186)"

This reverts commit 5f306b04b8.

backend/app/controllers/tag_children_controller.rb

@@ -1,27 +0,0 @@
-class TagChildrenController < ApplicationController
-  def create
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.admin?
-
-    parent_id = params[:parent_id]
-    child_id = params[:child_id]
-    return head :bad_request if parent_id.blank? || child_id.blank?
-
-    Tag.find(parent_id).children << Tag.find(child_id) rescue nil
-
-    head :no_content
-  end
-
-  def destroy
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.admin?
-
-    parent_id = params[:parent_id]
-    child_id = params[:child_id]
-    return head :bad_request if parent_id.blank? || child_id.blank?
-
-    Tag.find(parent_id).children.delete(Tag.find(child_id)) rescue nil
-
-    head :no_content
-  end
-end

backend/app/controllers/tags_controller.rb

@@ -39,17 +39,6 @@ class TagsController < ApplicationController
   end
 
   def update
-    return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
-
-    tag = Tag.find(params[:id])
-
-    attrs = { name: params[:name].presence,
-              category: params[:category].presence }.compact
-
-    tag.update!(attrs) if attrs.present?
-
-    render json: tag
   end
 
   def destroy