Initial commit: Horux Backend API

- API REST para gestion de facturas electronicas mexicanas (CFDI)
- Laravel 9 con autenticacion OAuth 2.0 (Passport)
- Integracion con Syntage, Clerk y Facturama
- 30 modelos Eloquent, 39 controladores
- Documentacion completa en /docs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/services.php

@@ -0,0 +1,41 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Third Party Services
+    |--------------------------------------------------------------------------
+    |
+    | This file is for storing the credentials for third party services such
+    | as Mailgun, Postmark, AWS and more. This file provides the de facto
+    | location for this type of information, allowing packages to have
+    | a conventional file to locate the various service credentials.
+    |
+    */
+
+    'mailgun' => [
+        'domain' => env('MAILGUN_DOMAIN'),
+        'secret' => env('MAILGUN_SECRET'),
+        'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'),
+        'scheme' => 'https',
+    ],
+
+    'postmark' => [
+        'token' => env('POSTMARK_TOKEN'),
+    ],
+
+    'ses' => [
+        'key' => env('AWS_ACCESS_KEY_ID'),
+        'secret' => env('AWS_SECRET_ACCESS_KEY'),
+        'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),
+    ],
+
+    'clerk' => [
+      'client_id' => env('CLERK_CLIENT_ID'),
+      'client_secret' => env('CLERK_CLIENT_SECRET'),
+      'redirect' => env('CLERK_CALLBACK_URL'),
+      'base_url' => env('CLERK_BASE_URL'),
+    ],
+
+];