feat: add Password field to PomodoroClient struct

remove unused password parameters from Client-Methods

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pkg/models/client.go

@@ -4,5 +4,6 @@ import "github.com/gorilla/websocket"
 
 // Represents a websocket client
 type PomodoroClient struct {
-	Conn *websocket.Conn // The websocket connection of the client
+	Conn     *websocket.Conn // The websocket connection of the client
+	Password string          // Pomodoro password
 }