zjncs opened a new pull request, #6325:
URL: https://github.com/apache/rocketmq-dashboard/pull/6325

   ### What
   
   DashboardStatsVO is the headline counter block the ops home renders. It had 
no test. This pins: every counter round-trips through the builder, and a fresh 
stats block reads as an empty deployment - zero clusters, zero traffic - rather 
than nulls the cards would have to guard against.
   
   ### Verification
   
   - New tests on unmodified code: **2/2 green**, checkstyle clean.
   - Discriminating mutation: the totalClusters default drifted to 1 (red).
   - Restored: green. Test-only change; no product code touched.


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