add endpoint for flowchart's detail

flowchart/urls/oj.py

@@ -3,12 +3,14 @@ from ..views.oj import (
     FlowchartSubmissionAPI,
     FlowchartSubmissionListAPI,
     FlowchartSubmissionRetryAPI,
-    FlowchartSubmissionCurrentAPI
+    FlowchartSubmissionCurrentAPI,
+    FlowchartSubmissionDetailAPI,
 )
 
 urlpatterns = [
     path('flowchart/submission', FlowchartSubmissionAPI.as_view()),
     path('flowchart/submissions', FlowchartSubmissionListAPI.as_view()),
     path('flowchart/submission/retry', FlowchartSubmissionRetryAPI.as_view()),
+    path('flowchart/submission/detail', FlowchartSubmissionDetailAPI.as_view()),
     path('flowchart/submission/current', FlowchartSubmissionCurrentAPI.as_view()),
 ]