feat: bootstrap Laravel 13 foundation (Fase 0)

Implement OpenSpec change setup-foundation: Laravel 13 + Filament 5
admin panel, Livewire 4 public site shell, PostgreSQL via Compose,
design tokens, role-based auth, quality gates (Pint/Larastan/Pest),
FrankenPHP Dockerfile, and GitHub Actions CI with five blocking jobs.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -0,0 +1,27 @@
+*.log
+.DS_Store
+.env
+.env.backup
+.env.production
+.phpactor.json
+.phpunit.result.cache
+/.codex
+/.cursor/
+/.idea
+/.nova
+/.phpunit.cache
+/.vscode
+/.zed
+/auth.json
+/node_modules
+/public/build
+/public/fonts-manifest.dev.json
+/public/hot
+/public/storage
+/storage/*.key
+/storage/pail
+/vendor
+_ide_helper.php
+Homestead.json
+Homestead.yaml
+Thumbs.db