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/Users/ForgotPasswordResult.cs

@@ -5,28 +5,26 @@
 #nullable disable
 #pragma warning disable CS1591
 
-using System;
+using global::System;
 
-namespace MediaBrowser.Model.Users
-{
-    public class ForgotPasswordResult
-    {
-        /// <summary>
-        /// Gets or sets the action.
-        /// </summary>
-        /// <value>The action.</value>
-        public ForgotPasswordAction Action { get; set; }
+namespace MediaBrowser.Model.Users;
+   public class ForgotPasswordResult
+   {
+       /// <summary>
+       /// Gets or sets the action.
+       /// </summary>
+       /// <value>The action.</value>
+       public ForgotPasswordAction Action { get; set; }
 
-        /// <summary>
-        /// Gets or sets the pin file.
-        /// </summary>
-        /// <value>The pin file.</value>
-        public string PinFile { get; set; }
+       /// <summary>
+       /// Gets or sets the pin file.
+       /// </summary>
+       /// <value>The pin file.</value>
+       public string PinFile { get; set; }
 
-        /// <summary>
-        /// Gets or sets the pin expiration date.
-        /// </summary>
-        /// <value>The pin expiration date.</value>
-        public DateTime? PinExpirationDate { get; set; }
-    }
-}
+       /// <summary>
+       /// Gets or sets the pin expiration date.
+       /// </summary>
+       /// <value>The pin expiration date.</value>
+       public DateTime? PinExpirationDate { get; set; }
+   }