fix(student): 修复学生状态查询逻辑

web-infrastructure/src/main/resources/mapper/study/StudentMapper.xml

@@ -199,6 +199,7 @@
             case when s.state = 1 then 1
                 when s.state = 0 and c.start_time > now() then 0
                 when s.state = 0 and c.start_time <= now() and c.end_time >= now() then 2
+                when s.state = 0 and  c.end_time <= now() then 3
             end as state,
             s.interested_ids,
             s.interested_names,