Log the message more clear when network manager is not ready (#15055)

Jellyfin.Server/ServerSetupApp/SetupServer.cs

@@ -250,6 +250,7 @@ public sealed class SetupServer : IDisposable
                                                 { "isInReportingMode", _isUnhealthy },
                                                 { "retryValue", retryAfterValue },
                                                 { "logs", startupLogEntries },
+                                                { "networkManagerReady", networkManager is not null },
                                                 { "localNetworkRequest", networkManager is not null && context.Connection.RemoteIpAddress is not null && networkManager.IsInLocalNetwork(context.Connection.RemoteIpAddress) }
                                             },
                                             new ByteCounterStream(context.Response.BodyWriter.AsStream(), IODefaults.FileStreamBufferSize, true, _startupUiRenderer.ParserOptions))

Jellyfin.Server/ServerSetupApp/index.mstemplate.html

@@ -213,7 +213,12 @@
             </ol>
         </div>
         {{#ELSE}}
+        {{#IF networkManagerReady}}
         <p>Please visit this page from your local network to view detailed startup logs.</p>
+        {{#ELSE}}
+        <p>Initializing network settings. Please wait.</p>
+        {{/ELSE}}
+        {{/IF}}
         {{/ELSE}}
         {{/IF}}
     </div>