feat: show today's failed tasks from dashboard

Add a failure list with task names, commands, accumulated failure counts and latest log links. Keep recovered and deleted tasks visible in today's statistics.

Fixes #3065

back/api/dashboard.ts

@@ -107,6 +107,43 @@ export default (app: Router) => {
     },
   );
 
+  route.get(
+    '/failures',
+    async (req: Request, res: Response, next: NextFunction) => {
+      try {
+        const rows = (await CrontabStatModel.findAll({
+          attributes: ['ref_id', [fn('SUM', col('fail_count')), 'fail_count']],
+          where: { date: dayjs().format('YYYY-MM-DD'), fail_count: { [Op.gt]: 0 } },
+          group: ['ref_id'],
+          order: [[fn('SUM', col('fail_count')), 'DESC'], ['ref_id', 'ASC']],
+          raw: true,
+        })) as any[];
+        const crons = rows.length > 0 ? await CrontabModel.findAll({
+          attributes: ['id', 'name', 'command'],
+          where: { id: { [Op.in]: rows.map((row) => Number(row.ref_id)) } },
+          raw: true,
+        }) : [];
+        const cronMap = new Map(crons.map((cron) => [cron.id, cron]));
+        res.send({
+          code: 200,
+          data: rows.map((row) => {
+            const id = Number(row.ref_id);
+            const cron = cronMap.get(id);
+            return {
+              id,
+              name: cron?.name || cron?.command || tf('任务#%s', id),
+              command: cron?.command || '',
+              failCount: Number(row.fail_count),
+              deleted: !cron,
+            };
+          }),
+        });
+      } catch (e) {
+        next(e);
+      }
+    },
+  );
+
   route.get(
     '/trend',
     async (req: Request, res: Response, next: NextFunction) => {