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/Providers/SubtitleOptions.cs

@@ -5,36 +5,37 @@
 #nullable disable
 #pragma warning disable CS1591
 
-using System;
+using global::System;
 
-namespace MediaBrowser.Model.Providers
-{
-    public class SubtitleOptions
-    {
-        public SubtitleOptions()
-        {
-            DownloadLanguages = Array.Empty<string>();
+namespace MediaBrowser.Model.Providers;
+   public class SubtitleOptions
+   {
+       /// <summary>
+       /// Initializes a new instance of the <see cref="SubtitleOptions"/> class.
+       /// </summary>
+       public SubtitleOptions()
+       {
+           DownloadLanguages = Array.Empty<string>();
 
-            SkipIfAudioTrackMatches = true;
-            RequirePerfectMatch = true;
-        }
+           SkipIfAudioTrackMatches = true;
+           RequirePerfectMatch = true;
+       }
 
-        public bool SkipIfEmbeddedSubtitlesPresent { get; set; }
+       public bool SkipIfEmbeddedSubtitlesPresent { get; set; }
 
-        public bool SkipIfAudioTrackMatches { get; set; }
+       public bool SkipIfAudioTrackMatches { get; set; }
 
-        public string[] DownloadLanguages { get; set; }
+       public string[] DownloadLanguages { get; set; }
 
-        public bool DownloadMovieSubtitles { get; set; }
+       public bool DownloadMovieSubtitles { get; set; }
 
-        public bool DownloadEpisodeSubtitles { get; set; }
+       public bool DownloadEpisodeSubtitles { get; set; }
 
-        public string OpenSubtitlesUsername { get; set; }
+       public string OpenSubtitlesUsername { get; set; }
 
-        public string OpenSubtitlesPasswordHash { get; set; }
+       public string OpenSubtitlesPasswordHash { get; set; }
 
-        public bool IsOpenSubtitleVipAccount { get; set; }
+       public bool IsOpenSubtitleVipAccount { get; set; }
 
-        public bool RequirePerfectMatch { get; set; }
-    }
-}
+       public bool RequirePerfectMatch { get; set; }
+   }