Optimize Collection page load with Task.WhenAll and fix BaseAddress SSR prerendering check in Users.razor

src/dotnet/QuantEngine.Web/Client/Pages/Collection.razor

@@ -107,8 +107,14 @@ else if (DashboardState != null)
         IsLoading = true;
         try
         {
-            DashboardState = await ApiClient.GetCollectionStateAsync();
-            var runsResponse = await ApiClient.GetCollectionRunsAsync(10);
+            // Parallelize API calls to avoid sequential RTT bottlenecks
+            var stateTask = ApiClient.GetCollectionStateAsync();
+            var runsTask = ApiClient.GetCollectionRunsAsync(10);
+            
+            await Task.WhenAll(stateTask, runsTask);
+            
+            DashboardState = await stateTask;
+            var runsResponse = await runsTask;
             RecentRuns = runsResponse?.Runs ?? new();
         }
         catch (Exception ex)

src/dotnet/QuantEngine.Web/Client/Pages/Users.razor

@@ -136,6 +136,10 @@
     {
         try
         {
+            if (Http.BaseAddress == null)
+            {
+                Http.BaseAddress = new Uri("http://localhost:5265/");
+            }
             var res = await Http.GetFromJsonAsync<List<UserDto>>("api/users");
             if (res != null)
             {