Add seasonal content support and enhance custom media ID handling

Jellyfin.Plugin.MediaBarEnhanced/Configuration/PluginConfiguration.cs

@@ -34,6 +34,7 @@ namespace Jellyfin.Plugin.MediaBarEnhanced.Configuration
         public bool EnableCustomMediaIds { get; set; } = true;
         public string PreferredVideoQuality { get; set; } = "Auto";
         public bool EnableSeasonalContent { get; set; } = false;
+        public string SeasonalSections { get; set; } = "[]";
         public bool IsEnabled { get; set; } = true;
         public bool EnableClientSideSettings { get; set; } = false;
         public bool ApplyLimitsToCustomIds { get; set; } = false;