feat: refactor connection handling to use models.Client

- introduce `Client` model
- modify all websocket operations to use the new `Client` model
- update function signatures to accept `models.Client` instead of `*websocket.Conn`
- ensure consistent usage of `client` across all related functions

🤖

cmd/client/main.go

@@ -35,11 +35,11 @@ func Start() {
 		config = helper.ParseConfig(*configfile)
 	}
 
-	conn := websocket.Connect(config.URL)
+	client := websocket.Connect(config.URL)
 
 	channel := make(chan GoTomato.ServerMessage)
-	go websocket.ProcessServerMessages(conn, channel)
-	frontend.UpdateLoop(conn, config, channel)
+	go websocket.ProcessServerMessages(client, channel)
+	frontend.UpdateLoop(client, config, channel)
 
-	websocket.Disconnect(conn)
+	websocket.Disconnect(client)
 }