login/logout logic, breadcrumbs, initial ui stuff

backend/internal/models/user.go

@@ -7,6 +7,7 @@ type User struct {
 	Username  string `gorm:"not null"`
 	Password  string `gorm:"not null"`
 	IsAdmin   bool   `gorm:"not null"`
+	IsRoot    bool   `gorm:"not null"`
 	IsActive  bool   `gorm:"not null"`
 	CreatedAt time.Time
 	UpdatedAt time.Time