feat: add version and protocol version

- define GoTomatoVersion constant for versioning
- add protocol version field to all server messages
- add `-version` cli parameter
- update README

🤖

cmd/server/main.go

@@ -3,11 +3,14 @@ package server
 import (
 	"flag"
 	"fmt"
+	"git.smsvc.net/pomodoro/GoTomato/internal/metadata"
 	"git.smsvc.net/pomodoro/GoTomato/internal/shared"
 	"git.smsvc.net/pomodoro/GoTomato/internal/websocket"
 	"git.smsvc.net/pomodoro/GoTomato/pkg/models"
 	"log"
 	"net/http"
+	"os"
+	"strings"
 )
 
 func Start() {
@@ -15,8 +18,16 @@ func Start() {
 	listenAddress := flag.String("listenAddress", shared.DefaultServerConfig.ListenAddress, "IP address to listen on")
 	listenPort := flag.Int("listenPort", shared.DefaultServerConfig.ListenPort, "Port to listen on")
 	password := flag.String("password", "", "Control password for pomodoro session (optional)")
+	showVersionFlag := flag.Bool("version", false, "Output version")
 	flag.Parse()
 
+	shared.Message.GoTomatoVersion = strings.Split(metadata.GoTomatoVersion, ".")[0]
+	if *showVersionFlag {
+		fmt.Printf("App-Version: %s\n", metadata.GoTomatoVersion)
+		fmt.Printf("Protocol-Version: %s\n", shared.Message.GoTomatoVersion)
+		os.Exit(0)
+	}
+
 	serverConfig := models.GoTomatoServerConfig{
 		ListenAddress: *listenAddress,
 		ListenPort:    *listenPort,