opt: unify the end-of-line markers in the MCP session filter. (#2403)

plugins/golang-filter/mcp-session/common/sse.go

@@ -136,7 +136,7 @@ func (s *SSEServer) HandleSSE(cb api.FilterCallbackHandler, stopChan chan struct
 	}
 
 	// Send the initial endpoint event
-	initialEvent := fmt.Sprintf("event: endpoint\ndata: %s\r\n\r\n", messageEndpoint)
+	initialEvent := fmt.Sprintf("event: endpoint\ndata: %s\n\n", messageEndpoint)
 	err = s.redisClient.Publish(channel, initialEvent)
 	if err != nil {
 		api.LogErrorf("Failed to send initial event: %v", err)
@@ -210,7 +210,7 @@ func (s *SSEServer) HandleMessage(w http.ResponseWriter, r *http.Request, body j
 	var status int
 	// Only send response if there is one (not for notifications)
 	if response != nil {
-		if sessionID != ""{
+		if sessionID != ""  {
 			w.WriteHeader(http.StatusAccepted)
 			status = http.StatusAccepted
 		} else {