Potential fix for pull request finding 'Generic catch clause'

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: BenjaminMichaelis

EssentialCSharp.Web/Program.cs

@@ -587,7 +587,17 @@ await McpJsonRpcResponseWriter.WriteErrorAsync(
             SitemapXmlHelpers.EnsureSitemapHealthy(siteMappingService.SiteMappings.ToList());
             LogSitemapValidationSucceeded(logger);
         }
-        catch (Exception ex)
+        catch (InvalidOperationException ex)
+        {
+            LogSitemapValidationFailed(logger, ex);
+            // Continue startup even if sitemap validation fails
+        }
+        catch (ArgumentException ex)
+        {
+            LogSitemapValidationFailed(logger, ex);
+            // Continue startup even if sitemap validation fails
+        }
+        catch (FormatException ex)
         {
             LogSitemapValidationFailed(logger, ex);
             // Continue startup even if sitemap validation fails