refactor(ops): 优化任务心跳和组件刷新机制

后端改动:
- 添加 ops_job_heartbeats.last_result 字段记录任务执行结果
- 优化告警评估器统计信息(规则数/事件数/邮件数)
- 统一各定时任务的心跳记录格式

前端改动:
- 重构 OpsConcurrencyCard 使用父组件统一控制刷新节奏
- 移除独立的 5 秒刷新定时器,改用 refreshToken 机制
- 修复 TypeScript 类型错误

backend/internal/service/ops_cleanup_service.go

@@ -149,7 +149,7 @@ func (s *OpsCleanupService) runScheduled() {
 		log.Printf("[OpsCleanup] cleanup failed: %v", err)
 		return
 	}
-	s.recordHeartbeatSuccess(runAt, time.Since(startedAt))
+	s.recordHeartbeatSuccess(runAt, time.Since(startedAt), counts)
 	log.Printf("[OpsCleanup] cleanup complete: %s", counts)
 }
 
@@ -330,12 +330,13 @@ func (s *OpsCleanupService) tryAcquireLeaderLock(ctx context.Context) (func(), b
 	return release, true
 }
 
-func (s *OpsCleanupService) recordHeartbeatSuccess(runAt time.Time, duration time.Duration) {
+func (s *OpsCleanupService) recordHeartbeatSuccess(runAt time.Time, duration time.Duration, counts opsCleanupDeletedCounts) {
 	if s == nil || s.opsRepo == nil {
 		return
 	}
 	now := time.Now().UTC()
 	durMs := duration.Milliseconds()
+	result := truncateString(counts.String(), 2048)
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
 	defer cancel()
 	_ = s.opsRepo.UpsertJobHeartbeat(ctx, &OpsUpsertJobHeartbeatInput{
@@ -343,6 +344,7 @@ func (s *OpsCleanupService) recordHeartbeatSuccess(runAt time.Time, duration tim
 		LastRunAt:      &runAt,
 		LastSuccessAt:  &now,
 		LastDurationMs: &durMs,
+		LastResult:     &result,
 	})
 }