添加contest ip限制api；

OI problem的AC，total count也算入profile了

account/models.py

@@ -59,6 +59,9 @@ class User(AbstractBaseUser):
     def can_mgmt_all_problem(self):
         return self.problem_permission == ProblemPermission.ALL
 
+    def is_contest_admin(self, contest):
+        return self.is_authenticated() and (contest.created_by == self or self.admin_type == AdminType.SUPER_ADMIN)
+
     class Meta:
         db_table = "user"