新增：接口service构建

app/services/reposync/delete_branch_service.rb

@@ -0,0 +1,19 @@
+class Reposync::DeleteBranchService < Reposync::ClientService
+
+  attr_accessor :repo_name, :branch_name
+
+  def initialize(repo_name, branch_name)
+    @repo_name = repo_name
+    @branch_name = branch_name
+  end
+
+  def call 
+    result = delete(url)
+    response = render_response(result)
+  end
+
+  private
+  def url 
+    "/cerobot/sync/#{repo_name}/branch/#{branch_name}"
+  end
+end