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/Configuration/ServerConfiguration.cs

@@ -5,7 +5,7 @@
 #pragma warning disable CS1591
 #pragma warning disable CA1819
 
-using System;
+using global::System;
 using MediaBrowser.Model.Drawing;
 using MediaBrowser.Model.Dto;
 using MediaBrowser.Model.System;
@@ -27,17 +27,17 @@ public class ServerConfiguration : BaseApplicationConfiguration
         {
             new MetadataOptions()
             {
-                ItemType = "Book"
+                ItemType = "Book",
             },
             new MetadataOptions()
             {
-                ItemType = "Movie"
+                ItemType = "Movie",
             },
             new MetadataOptions
             {
                 ItemType = "MusicVideo",
                 DisabledMetadataFetchers = new[] { "The Open Movie Database" },
-                DisabledImageFetchers = new[] { "The Open Movie Database" }
+                DisabledImageFetchers = new[] { "The Open Movie Database" },
             },
             new MetadataOptions
             {
@@ -46,16 +46,16 @@ public class ServerConfiguration : BaseApplicationConfiguration
             new MetadataOptions
             {
                 ItemType = "MusicAlbum",
-                DisabledMetadataFetchers = new[] { "TheAudioDB" }
+                DisabledMetadataFetchers = new[] { "TheAudioDB" },
             },
             new MetadataOptions
             {
                 ItemType = "MusicArtist",
-                DisabledMetadataFetchers = new[] { "TheAudioDB" }
+                DisabledMetadataFetchers = new[] { "TheAudioDB" },
             },
             new MetadataOptions
             {
-                ItemType = "BoxSet"
+                ItemType = "BoxSet",
             },
             new MetadataOptions
             {