新增：issue更新者字段

app/services/api/v1/issues/create_service.rb

@@ -67,6 +67,7 @@ class Api::V1::Issues::CreateService < ApplicationService
       @created_issue.root_id = @root_id
       @created_issue.time_scale = @time_scale
       @created_issue.issue_tags_value = @issue_tags.order("id asc").pluck(:id).join(",") unless issue_tag_ids.blank?
+      @created_issue.changer_id = @current_user.id
       @created_issue.save!
 
       if Site.has_blockchain? && @project.use_blockchain

app/services/api/v1/issues/update_service.rb

@@ -79,6 +79,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
       @updated_issue.time_scale = @time_scale unless @time_scale.nil?
 
       @updated_issue.updated_on = Time.now
+      @updated_issue.changer_id = current_user.id
       @updated_issue.save!
 
       build_after_issue_journal_details if @updated_issue.previous_changes.present? # 操作记录