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>

app/Policies/UserPolicy.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Policies;
+
+use App\Models\User;
+
+class UserPolicy
+{
+    public function viewAny(User $user): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function view(User $user, User $model): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function create(User $user): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function update(User $user, User $model): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function delete(User $user, User $model): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function restore(User $user, User $model): bool
+    {
+        return $user->isAdmin();
+    }
+
+    public function forceDelete(User $user, User $model): bool
+    {
+        return $user->isAdmin();
+    }
+}