新增：用户反馈意见后台管理逻辑

db/migrate/20221108100538_create_feedback_message_histories.rb

@@ -0,0 +1,12 @@
+class CreateFeedbackMessageHistories < ActiveRecord::Migration[5.2]
+  def change
+    create_table :feedback_message_histories do |t|
+      t.references :feedback
+      t.references :user
+      t.string :title 
+      t.text :content
+
+      t.timestamps
+    end
+  end
+end