fix: adjust api of add_interaction

app/api/v1/exception/interaction.py

@@ -6,6 +6,11 @@ class AddInteractionError(HTTPError):
     message = 'add interaction failed.'
 
 
+class InteractionExistedError(HTTPError):
+    status_code = 401
+    message = '已经提交过，不能再次提交～'
+
+
 class InteractionTodayBriefNotFound(HTTPError):
     status_code = 404
     message = '找不到用户对应的食物记录'