新增：存储pull_request源仓库信息

app/controllers/projects_controller.rb

@@ -217,6 +217,10 @@ class ProjectsController < ApplicationController
 
         new_project_params = project_params.except(:private).merge(is_public: !private)
         @project.update_attributes!(new_project_params)
+        fork_pull_requests = PullRequest.where(fork_project_id: @project.id)
+        if fork_pull_requests.present? 
+          fork_pull_requests.update_all(fork_project_identifier: @project.identifier)
+        end
         @project.forked_projects.map{|p| p.update!(is_public: @project.is_public)}
         gitea_params = {
           private: private,