Use dynamic GraphBaseUrl for scope URL construction

Replaced hardcoded "https://graph.microsoft.com/" with graph.GraphBaseUrl when building Microsoft Graph scope URLs. This improves flexibility and allows support for different Graph API base URLs.

Author: sellakumaran

src/Microsoft.Agents.A365.DevTools.Cli/Commands/SetupSubcommands/BatchPermissionsOrchestrator.cs

@@ -185,7 +185,7 @@ internal static class BatchPermissionsOrchestrator
                 logger.LogWarning("Re-run 'a365 setup admin' to retry once propagation is complete.");
                 var graphScopes = specs
                     .Where(s => s.ResourceAppId == AuthenticationConstants.MicrosoftGraphResourceAppId)
-                    .SelectMany(s => s.Scopes.Select(scope => $"https://graph.microsoft.com/{scope}"))
+                    .SelectMany(s => s.Scopes.Select(scope => $"{graph.GraphBaseUrl}/{scope}"))
                     .Distinct(StringComparer.OrdinalIgnoreCase)
                     .ToList();
                 var retryConsentUrl = graphScopes.Count > 0