feat: allow restrict Pomodoro via password

- introduce password flag in server command line options
- update clientCommand model
- add password requirement for controlling the Pomodoro timer
- document password in README

internal/websocket/client_commands.go

@@ -30,26 +30,28 @@ func handleClientCommands(ws *websocket.Conn) {
 			continue
 		}
 
-		// Process the command
-		switch clientCommand.Command {
-		case "start":
-			if !pomodoro.IsPomodoroOngoing() {
-				if clientCommand.Config != shared.UnsetPomodoroConfig {
-					pomodoroConfig = clientCommand.Config
+		// Process the command if pomodoro password matches
+		if clientCommand.Password == shared.PomodoroPassword {
+			switch clientCommand.Command {
+			case "start":
+				if !pomodoro.IsPomodoroOngoing() {
+					if clientCommand.Config != shared.UnsetPomodoroConfig {
+						pomodoroConfig = clientCommand.Config
+					}
+					go pomodoro.RunPomodoro(pomodoroConfig) // Start the timer with the list of clients
+				}
+			case "stop":
+				if pomodoro.IsPomodoroOngoing() {
+					pomodoro.ResetPomodoro() // Reset Pomodoro
+				}
+			case "pause":
+				if pomodoro.IsPomodoroOngoing() && !pomodoro.IsPomodoroPaused() {
+					pomodoro.PausePomodoro() // Pause the timer
+				}
+			case "resume":
+				if pomodoro.IsPomodoroOngoing() && pomodoro.IsPomodoroPaused() {
+					pomodoro.ResumePomodoro() // Resume the timer
 				}
-				go pomodoro.RunPomodoro(pomodoroConfig) // Start the timer with the list of clients
-			}
-		case "stop":
-			if pomodoro.IsPomodoroOngoing() {
-				pomodoro.ResetPomodoro() // Reset Pomodoro
-			}
-		case "pause":
-			if pomodoro.IsPomodoroOngoing() && !pomodoro.IsPomodoroPaused() {
-				pomodoro.PausePomodoro() // Pause the timer
-			}
-		case "resume":
-			if pomodoro.IsPomodoroOngoing() && pomodoro.IsPomodoroPaused() {
-				pomodoro.ResumePomodoro() // Resume the timer
 			}
 		}