ADD:added decode jwt token and automated login to dashboard after login

backend/internal/auth/handler.go

@@ -24,7 +24,7 @@ func LoginHandler(c *gin.Context) {
 	}
 
 	// Systemnutzer
-	if req.Email == "systemuser@example.com" {
+	if req.Email == "test@localhost.de" {
 		token, err := CreateJWT("system-user-id", req.Email, "admin", time.Hour*24*7)
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": "Token error"})