Improve POST body debugging for playback endpoints

- Better logging to show what client sends vs what we forward
- Log all headers when body is empty to help diagnose issues

allstarr/Controllers/JellyfinController.cs

@@ -1546,28 +1546,32 @@ public class JellyfinController : ControllerBase
                 
                 // Read body using StreamReader with proper encoding
                 string body;
-                using (var reader = new StreamReader(Request.Body, System.Text.Encoding.UTF8, leaveOpen: true))
+                using (var reader = new StreamReader(Request.Body, System.Text.Encoding.UTF8, detectEncodingFromByteOrderMarks: false, bufferSize: 1024, leaveOpen: true))
                 {
                     body = await reader.ReadToEndAsync();
                 }
                 
-                // Reset stream position after reading
+                // Reset stream position after reading so it can be read again if needed
                 Request.Body.Position = 0;
                 
                 if (string.IsNullOrWhiteSpace(body))
                 {
-                    _logger.LogWarning("Empty POST body for {Path}, ContentLength={ContentLength}, ContentType={ContentType}", 
+                    _logger.LogWarning("Empty POST body received from client for {Path}, ContentLength={ContentLength}, ContentType={ContentType}", 
                         fullPath, Request.ContentLength, Request.ContentType);
+                    
+                    // Log all headers to debug
+                    _logger.LogWarning("Request headers: {Headers}", 
+                        string.Join(", ", Request.Headers.Select(h => $"{h.Key}={h.Value}")));
                 }
                 else
                 {
-                    _logger.LogInformation("POST body for {Path}: {BodyLength} bytes, ContentType={ContentType}", 
+                    _logger.LogInformation("POST body received from client for {Path}: {BodyLength} bytes, ContentType={ContentType}", 
                         fullPath, body.Length, Request.ContentType);
                     
                     // Always log body content for playback endpoints to debug the issue
                     if (fullPath.Contains("Playing", StringComparison.OrdinalIgnoreCase))
                     {
-                        _logger.LogInformation("POST body content: {Body}", body);
+                        _logger.LogInformation("POST body content from client: {Body}", body);
                     }
                 }