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/MediaInfo/SubtitleTrackEvent.cs

@@ -4,22 +4,20 @@
 
 #pragma warning disable CS1591
 
-namespace MediaBrowser.Model.MediaInfo
-{
-    public class SubtitleTrackEvent
-    {
-        public SubtitleTrackEvent(string id, string text)
-        {
-            Id = id;
-            Text = text;
-        }
+namespace MediaBrowser.Model.MediaInfo;
+   public class SubtitleTrackEvent
+   {
+       public SubtitleTrackEvent(string id, string text)
+       {
+           Id = id;
+           Text = text;
+       }
 
-        public string Id { get; set; }
+       public string Id { get; set; }
 
-        public string Text { get; set; }
+       public string Text { get; set; }
 
-        public long StartPositionTicks { get; set; }
+       public long StartPositionTicks { get; set; }
 
-        public long EndPositionTicks { get; set; }
-    }
-}
+       public long EndPositionTicks { get; set; }
+   }