新增：新合并请求列表接口

app/controllers/concerns/api/pull_helper.rb

@@ -0,0 +1,19 @@
+module Api::PullHelper
+  extend ActiveSupport::Concern
+
+  def load_pull_request
+    pull_request_id = params[:pull_id] || params[:id]
+    @pull_request = @project.pull_requests.where(gitea_number: pull_request_id).where.not(id: pull_request_id).take || PullRequest.find_by_id(pull_request_id)
+    @issue = @pull_request&.issue
+    if @pull_request
+      logger.info "###########pull_request founded"
+			@pull_request
+    else
+			logger.info "###########pull_request not found"
+      @pull_request = nil
+       render_not_found and return
+    end
+
+    @pull_request
+  end
+end