feat(server): restructure Pomodoro server into modular components

- move server logic to cmd/server/main.go
- create packages for websocket, pomodoro and broadcast handling
- define models for messages
- remove old GoTomato.go file
- update README

🤖

internal/websocket/client_commands.go

@@ -0,0 +1,41 @@
+package websocket
+
+import (
+	"encoding/json"
+	"git.smsvc.net/pomodoro/GoTomato/internal/pomodoro"
+	"git.smsvc.net/pomodoro/GoTomato/pkg/models"
+	"github.com/gorilla/websocket"
+	"log"
+)
+
+// handleClientCommands listens for commands from WebSocket clients and dispatches to the timer.
+func handleClientCommands(ws *websocket.Conn) {
+	for {
+		_, message, err := ws.ReadMessage()
+		if err != nil {
+			log.Printf("Client disconnected: %v", err)
+			delete(Clients, ws)
+			break
+		}
+
+		// Handle incoming commands
+		var command models.ClientCommand
+		err = json.Unmarshal(message, &command)
+		if err != nil {
+			log.Printf("Error unmarshalling command: %v", err)
+			continue
+		}
+
+		// Process the command
+		switch command.Command {
+		case "start":
+			if !pomodoro.IsTimerRunning() {
+				go pomodoro.RunPomodoroTimer(Clients) // Start the timer with the list of clients
+			}
+		case "stop":
+			if pomodoro.IsTimerRunning() {
+				pomodoro.StopTimer() // Stop the timer in the Pomodoro package
+			}
+		}
+	}
+}