feat: complete Epic 0 — foundation migration & infrastructure setup

Stories 0.2-0.5: rename folders→declarations (backend+frontend), configure
Redis for cache/queue/sessions, add foundation database migrations
(permissions, archived_at), replace DeclarationStatus enum with architecture
lifecycle values, create DeclarationObserver for status transition validation
and auto-archive, fix controller status transitions to respect observer rules.

93 tests pass (240 assertions).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/Feature/Settings/TwoFactorAuthenticationTest.php

@@ -76,4 +76,4 @@ test('two factor settings page returns forbidden response when two factor is dis
         ->withSession(['auth.password_confirmed_at' => time()])
         ->get(route('two-factor.show'))
         ->assertForbidden();
-});
+});