fix: 降低 Jenkins 同步空扫描审计噪音

- deploy-runs: 自动同步无候选、无同步结果、无失败时不再写入成功 tick 审计\n- 保留存在候选或异常时的 Jenkins 同步审计可观测性

src/deploy-runs/jenkins-sync-scheduler.service.ts

@@ -186,6 +186,14 @@ export class JenkinsSyncSchedulerService
 
     try {
       const summary = await this.deployRunsService.syncJenkinsRuns();
+      const hasObservableWork =
+        summary.totalCandidates > 0 ||
+        summary.syncedRuns.length > 0 ||
+        summary.failedRuns.length > 0;
+
+      if (!hasObservableWork) {
+        return;
+      }
 
       await this.auditService.record({
         action: 'JENKINS_AUTO_SYNC_TICK_COMPLETED',