feat: 更新考试相关页面，优化任务状态处理，添加用户任务接口测试

api/models/examTask.ts

@@ -582,7 +582,6 @@ export class ExamTaskModel {
   }
 
   static async getUserTasks(userId: string): Promise<UserExamTask[]> {
-    const now = new Date().toISOString();
     const rows = await all(`
       SELECT 
         t.id,
@@ -606,9 +605,9 @@ export class ExamTaskModel {
         WHERE user_id = ?
         GROUP BY task_id
       ) q ON q.task_id = t.id
-      WHERE tu.user_id = ? AND t.start_at <= ? AND t.end_at >= ?
+      WHERE tu.user_id = ?
       ORDER BY t.start_at ASC, t.end_at ASC
-    `, [userId, userId, now, now]);
+    `, [userId, userId]);
 
     return rows.map(row => ({
       id: row.id,