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.

MediaBrowser.Model/Updates/RepositoryInfo.cs

@@ -2,29 +2,27 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
-namespace MediaBrowser.Model.Updates
-{
-    /// <summary>
-    /// Class RepositoryInfo.
-    /// </summary>
-    public class RepositoryInfo
-    {
-        /// <summary>
-        /// Gets or sets the name.
-        /// </summary>
-        /// <value>The name.</value>
-        public string? Name { get; set; }
+namespace MediaBrowser.Model.Updates;
+   /// <summary>
+   /// Class RepositoryInfo.
+   /// </summary>
+   public class RepositoryInfo
+   {
+       /// <summary>
+       /// Gets or sets the name.
+       /// </summary>
+       /// <value>The name.</value>
+       public string? Name { get; set; }
 
-        /// <summary>
-        /// Gets or sets the URL.
-        /// </summary>
-        /// <value>The URL.</value>
-        public string? Url { get; set; }
+       /// <summary>
+       /// Gets or sets the URL.
+       /// </summary>
+       /// <value>The URL.</value>
+       public string? Url { get; set; }
 
-        /// <summary>
-        /// Gets or sets a value indicating whether the repository is enabled.
-        /// </summary>
-        /// <value><c>true</c> if enabled.</value>
-        public bool Enabled { get; set; } = true;
-    }
-}
+       /// <summary>
+       /// Gets or sets a value indicating whether the repository is enabled.
+       /// </summary>
+       /// <value><c>true</c> if enabled.</value>
+       public bool Enabled { get; set; } = true;
+   }