Refactor JSON serialization for WebSocket responses

- Switched to using the compact JSON5 encoder for improved transport efficiency while preserving NaN/Infinity values in WebSocket subscription responses.
- Updated comments for clarity on the changes made to the serialization process.

src/web/api.rs

@@ -554,8 +554,8 @@ async fn handle_websocket_subscription(
                                     }),
                                 };
 
-                                // Use json5 to preserve NaN/Infinity values
-                                json5::to_string(&response)?
+                                // Use compact JSON5 encoder for transport efficiency, preserves NaN/Infinity
+                                json::to_string_compact(&response)?
                             };
 
                             log::debug!("Sending batch of messages over WebSocket subscription");