feat: handle X-Forward-For for log output

- add Gorilla handlers package for enhanced HTTP handling
- refactor HTTP server to use a new ServeMux for routing
- update ListenAndServe to utilize ProxyHeaders for better proxy support
- add RealIP field to client model
  - use RealIP fild for connect/disconnect log output

cmd/server/main.go

@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/charmbracelet/log"
+	"github.com/gorilla/handlers"
 	"net/http"
 	"os"
 
@@ -43,14 +44,15 @@ func Start() {
 	listen := fmt.Sprintf("%s:%d", serverConfig.ListenAddress, serverConfig.ListenPort)
 
 	// start connection handler and broadcast
-	http.HandleFunc("/ws", websocket.HandleConnection)
+	r := http.NewServeMux()
+	r.HandleFunc("/ws", websocket.HandleConnection)
 	go websocket.SendPermanentBroadCastMessage()
 
 	log.Info("GoTomato started", "version", metadata.GoTomatoVersion)
 	log.Info("Websocket listening", "address", listen)
 
 	// start the listener
-	err := http.ListenAndServe(listen, nil)
+	err := http.ListenAndServe(listen, handlers.ProxyHeaders(r))
 	if err != nil {
 		log.Fatal("Error starting server:", "msg", err)
 	}