fix(jellyfin): preserve native playlist totals

allstarr.Tests/Protocols/ProtocolRouteFixtureTests.cs

@@ -557,6 +557,31 @@ public sealed class ProtocolRouteFixtureTests
         Assert.Equal(HttpMethod.Head, observedMethod);
     }
 
+    [Fact]
+    public async Task JellyfinNativePlaylistItems_PreserveUpstreamTotalWhenEveryRowIsAudio()
+    {
+        const string playlistId = "0123456789abcdef0123456789abcdef";
+        using var factory = new ProtocolFactory("Jellyfin", request =>
+        {
+            if (request.RequestUri!.AbsolutePath == "/Users/Me")
+                return Json(StatusCodes.Status200OK, """{"Id":"user-1","Name":"Fixture User"}""");
+            if (request.RequestUri.AbsolutePath == "/Items")
+                return ItemLookup($$"""{"Id":"{{playlistId}}","Type":"Playlist"}""");
+            return Json(StatusCodes.Status200OK,
+                """{"Items":[{"Id":"song-1","Type":"Audio","Sentinel":"complete"}],"TotalRecordCount":903,"StartIndex":0}""");
+        });
+        using var client = factory.CreateClient();
+
+        using var response = await client.GetAsync(
+            $"/Playlists/{playlistId}/Items?Limit=100&api_key=fixture-key");
+        using var body = JsonDocument.Parse(await response.Content.ReadAsStringAsync());
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        Assert.Equal(903, body.RootElement.GetProperty("TotalRecordCount").GetInt32());
+        Assert.Equal("complete",
+            body.RootElement.GetProperty("Items")[0].GetProperty("Sentinel").GetString());
+    }
+
     [Fact]
     public async Task JellyfinSearchAdapter_PreservesFixtureStatusBodyAndPaging()
     {

allstarr/Controllers/JellyfinController.MusicSurface.cs

@@ -74,7 +74,13 @@ public partial class JellyfinController
             });
         }
 
-        var endpoint = $"Items/{Uri.EscapeDataString(musicLibraryId)}{Request.QueryString.Value}";
+        var credentialQuery = Request.Query
+            .Where(item => item.Key.Equals("api_key", StringComparison.OrdinalIgnoreCase) ||
+                           item.Key.Equals("access_token", StringComparison.OrdinalIgnoreCase) ||
+                           item.Key.Equals("ApiKey", StringComparison.OrdinalIgnoreCase))
+            .SelectMany(item => item.Value.Select(value =>
+                new KeyValuePair<string, string?>(item.Key, value)));
+        var endpoint = $"Items/{Uri.EscapeDataString(musicLibraryId)}{QueryString.Create(credentialQuery)}";
         var (body, statusCode) = await _proxyService.GetJsonAsync(endpoint, null, Request.Headers);
         return HandleProxyResponse(body, statusCode);
     }
@@ -198,6 +204,7 @@ public partial class JellyfinController
                 };
             }
 
+            var originalCount = items.Count;
             var filtered = items
                 .Where(item => item is JsonObject candidate &&
                                JellyfinMusicEndpointPolicy.IsMusicItemType(candidate["Type"]?.GetValue<string>()))
@@ -205,7 +212,7 @@ public partial class JellyfinController
                 .ToArray();
             items.Clear();
             foreach (var item in filtered) items.Add(item);
-            root["TotalRecordCount"] = filtered.Length;
+            if (filtered.Length != originalCount) root["TotalRecordCount"] = filtered.Length;
             return new ContentResult
             {
                 Content = root.ToJsonString(),