fix: use real Concurrency instead of LoadFactor for metrics and monitoring

LoadFactor should only affect scheduling weight, not load rate reporting.

backend/internal/service/ops_concurrency.go

@@ -64,9 +64,12 @@ func (s *OpsService) getAccountsLoadMapBestEffort(ctx context.Context, accounts
 		if acc.ID <= 0 {
 			continue
 		}
-		lf := acc.EffectiveLoadFactor()
-		if prev, ok := unique[acc.ID]; !ok || lf > prev {
-			unique[acc.ID] = lf
+		c := acc.Concurrency
+		if c <= 0 {
+			c = 1
+		}
+		if prev, ok := unique[acc.ID]; !ok || c > prev {
+			unique[acc.ID] = c
 		}
 	}
 

backend/internal/service/ops_metrics_collector.go

@@ -391,7 +391,7 @@ func (c *OpsMetricsCollector) collectConcurrencyQueueDepth(parentCtx context.Con
 		}
 		batch = append(batch, AccountWithConcurrency{
 			ID:             acc.ID,
-			MaxConcurrency: acc.EffectiveLoadFactor(),
+			MaxConcurrency: acc.Concurrency,
 		})
 	}
 	if len(batch) == 0 {