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/ProfileUpdateTest.php

@@ -64,7 +64,7 @@ test('user can delete their account', function () {
         ->assertRedirect(route('home'));
 
     $this->assertGuest();
-    expect($user->fresh())->toBeNull();
+    expect($user->fresh()->deleted_at)->not->toBeNull();
 });
 
 test('correct password must be provided to delete account', function () {
@@ -82,4 +82,4 @@ test('correct password must be provided to delete account', function () {
         ->assertRedirect(route('profile.edit'));
 
     expect($user->fresh())->not->toBeNull();
-});
+});