feat: add pprof server for memory profiling

main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"net/http"
+	_ "net/http/pprof"
 	"nofx/api"
 	"nofx/auth"
 	"nofx/backtest"
@@ -139,6 +141,14 @@ func main() {
 		}
 	}
 
+	// Start pprof server for profiling (port 6060)
+	go func() {
+		logger.Info("📊 Starting pprof server on :6060")
+		if err := http.ListenAndServe(":6060", nil); err != nil {
+			logger.Warnf("⚠️ pprof server error: %v", err)
+		}
+	}()
+
 	// Start API server
 	server := api.NewServer(traderManager, st, cryptoService, backtestManager, cfg.APIServerPort)
 	go func() {