Refactor: standardize namespace and using directive style

Refactored all C# test files to use explicit namespace declarations and moved all using directives inside the namespace block for consistency. Updated assembly info and cache files to reflect the new build. Adjusted MvcTestingAppManifest.json to use fully qualified assembly names. No functional changes; all updates are related to code style, organization, and project metadata.

src/Jellyfin.Networking/AutoDiscoveryHost.cs

@@ -2,6 +2,8 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
+namespace Jellyfin.Networking;
+
 using System;
 using System.Net;
 using System.Net.Sockets;
@@ -16,8 +18,6 @@ using MediaBrowser.Model.ApiClient;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
-namespace Jellyfin.Networking;
-
 /// <summary>
 /// <see cref="BackgroundService"/> responsible for responding to auto-discovery messages.
 /// </summary>

src/Jellyfin.Networking/HappyEyeballs/HttpClientExtension.cs

@@ -2,6 +2,8 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
+namespace Jellyfin.Networking.HappyEyeballs;
+
 /*
 The MIT License (MIT)
 
@@ -34,8 +36,6 @@ using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace Jellyfin.Networking.HappyEyeballs;
-
 /// <summary>
 /// Defines the <see cref="HttpClientExtension"/> class.
 ///

src/Jellyfin.Networking/Manager/NetworkManager.cs

@@ -2,6 +2,8 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
+namespace Jellyfin.Networking.Manager;
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
@@ -21,8 +23,6 @@ using Microsoft.Extensions.Logging;
 using static MediaBrowser.Controller.Extensions.ConfigurationExtensions;
 using IConfigurationManager = MediaBrowser.Common.Configuration.IConfigurationManager;
 
-namespace Jellyfin.Networking.Manager;
-
 /// <summary>
 /// Class to take care of network interface management.
 /// </summary>

src/Jellyfin.Networking/Udp/SocketFactory.cs

@@ -2,13 +2,13 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
+namespace Jellyfin.Networking.Udp;
+
 using System;
 using System.Net;
 using System.Net.Sockets;
 using MediaBrowser.Model.Net;
 
-namespace Jellyfin.Networking.Udp;
-
 /// <summary>
 /// Factory class to create different kinds of sockets.
 /// </summary>