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

pkg/models/client.go

@@ -14,7 +14,8 @@ type ClientCommand struct {
 
 // Represents a single client
 type WebsocketClient struct {
-	Conn *websocket.Conn
+	Conn   *websocket.Conn
+	RealIP string
 }
 
 // Sends a message to the websocket.