Answer:66

[T-DiegoF]

Migrated class-based guards to functional CanActivateFn and refactored AuthService to use Angular Signals.

Changes

• AuthService: replaced plain boolean/string properties with signal(), exposed them via asReadonly(), added isAdmin as a computed() signal
• authGuard / adminGuard: replaced @Injectable classes implementing CanActivate with plain CanActivateFn functions using inject()
• Guards return router.createUrlTree(['/']) instead of imperative router.navigate()
• app.routes.ts: updated to reference the functional guards directly