feat: add City10 platform with Laravel 13, AI agents, 3D viewer, and LGPD compliance

Initial commit of the complete City10 virtual city simulation platform.

Backend (Laravel 13):
- REST API with Sanctum tokens and session-based web authentication
- Role-based access control (admin/user) with middleware protection
- AI agent CRUD with OpenRouter.ai integration restricted to free models
- Store management with 3D coordinates and AI shopkeeper assignment
- Versioned legal documents (Terms, Privacy, Cookies) with LGPD audit trail
- Math CAPTCHA on public forms and multi-language support (pt_BR, en, es)

Frontend:
- Responsive Blade templates with Tailwind CSS v4
- Three.js 3D city viewer with SSE chat streaming to AI agents
- Admin panel for store and user administration

Infrastructure:
- MariaDB/MySQL database with comprehensive migrations
- Database seeders for demo content and test accounts
- PHPUnit test suite and Laravel Pint code styling
- Vite build configuration with hot reload

database/seeders/DatabaseSeeder.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+
+/**
+ * Master seeder orchestrating all initial dataset loaders.
+ *
+ * Order matters: legal documents and users are created first so that
+ * foreign keys from agents and stores resolve correctly.
+ */
+class DatabaseSeeder extends Seeder
+{
+    use WithoutModelEvents;
+
+    /**
+     * Seed the application's database.
+     */
+    public function run(): void
+    {
+        $this->call([
+            LegalDocumentSeeder::class,
+            UserSeeder::class,
+            CityContentSeeder::class,
+        ]);
+    }
+}