新增文本题库导入功能，题目新增“解析”字段

api/controllers/adminController.ts

@@ -187,6 +187,55 @@ export class AdminController {
     }
   }
 
+  static async getAllTaskStats(req: Request, res: Response) {
+    try {
+      const page = toPositiveInt(req.query.page, 1);
+      const limit = toPositiveInt(req.query.limit, 5);
+
+      const statusRaw = typeof req.query.status === 'string' ? req.query.status : undefined;
+      const status =
+        statusRaw === 'completed' || statusRaw === 'ongoing' || statusRaw === 'notStarted'
+          ? statusRaw
+          : undefined;
+
+      const endAtStart = typeof req.query.endAtStart === 'string' ? req.query.endAtStart : undefined;
+      const endAtEnd = typeof req.query.endAtEnd === 'string' ? req.query.endAtEnd : undefined;
+
+      if (endAtStart && !Number.isFinite(Date.parse(endAtStart))) {
+        return res.status(400).json({ success: false, message: 'endAtStart 参数无效' });
+      }
+      if (endAtEnd && !Number.isFinite(Date.parse(endAtEnd))) {
+        return res.status(400).json({ success: false, message: 'endAtEnd 参数无效' });
+      }
+
+      const { ExamTaskModel } = await import('../models/examTask');
+      const result = await ExamTaskModel.getAllTasksWithStatsPaged({
+        page,
+        limit,
+        status,
+        endAtStart,
+        endAtEnd,
+      });
+
+      res.json({
+        success: true,
+        data: result.data,
+        pagination: {
+          page,
+          limit,
+          total: result.total,
+          pages: Math.ceil(result.total / limit),
+        },
+      });
+    } catch (error: any) {
+      console.error('获取任务统计失败:', error);
+      res.status(500).json({
+        success: false,
+        message: error.message || '获取任务统计失败',
+      });
+    }
+  }
+
   static async getDashboardOverview(req: Request, res: Response) {
     try {
       const { QuizModel } = await import('../models');