关卡列表接口调整

app/models/challenge.rb

@@ -75,7 +75,7 @@ class Challenge < ApplicationRecord
     if identifier.present?
       shixun.task_pass || self.status != 3 ? "/tasks/#{identifier}" : ""
     else
-      self.position == 1 ? "/api/shixuns/#{shixun.identifier}/shixun_exec" : ""
+      self.position == 1 ? "/shixuns/#{shixun.identifier}/shixun_exec.json" : ""
     end
   end