Fix bitrate showing 0K for favorited songs and browse views

- Ensure MediaSources field is included when proxying browse requests
- Applies to /Users/{userId}/Items (favorites, recently played, etc)
- Jellyfin doesn't include MediaSources by default, must be requested
- Now bitrate info shows correctly in all browse contexts

allstarr/Controllers/JellyfinController.cs

@@ -123,10 +123,23 @@ public class JellyfinController : ControllerBase
             
             // Build the full endpoint path with query string
             var endpoint = userId != null ? $"Users/{userId}/Items" : "Items";
-            if (Request.QueryString.HasValue)
+            
+            // Ensure MediaSources is included in Fields parameter for bitrate info
+            var queryString = Request.QueryString.Value ?? "";
+            if (!queryString.Contains("Fields=", StringComparison.OrdinalIgnoreCase))
             {
-                endpoint = $"{endpoint}{Request.QueryString.Value}";
+                // No Fields parameter, add MediaSources
+                queryString = string.IsNullOrEmpty(queryString) 
+                    ? "?Fields=MediaSources" 
+                    : $"{queryString}&Fields=MediaSources";
             }
+            else if (!queryString.Contains("MediaSources", StringComparison.OrdinalIgnoreCase))
+            {
+                // Fields parameter exists but doesn't include MediaSources, append it
+                queryString = $"{queryString},MediaSources";
+            }
+            
+            endpoint = $"{endpoint}{queryString}";
             
             var (browseResult, statusCode) = await _proxyService.GetJsonAsync(endpoint, null, Request.Headers);