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>

.dockerignore

@@ -0,0 +1,19 @@
+.git
+.github
+.codex
+.cursor
+.env
+.env.*
+!.env.example
+node_modules
+vendor
+storage/logs
+storage/framework/cache
+storage/framework/sessions
+storage/framework/views
+bootstrap/cache
+tests
+.phpunit.result.cache
+coverage
+.worktrees
+worktrees