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>

app/Services/SocialUserResolver.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Services;
+
+use Exception;
+use Coderello\SocialGrant\Resolvers\SocialUserResolverInterface;
+use Illuminate\Contracts\Auth\Authenticatable;
+use Laravel\Socialite\Facades\Socialite;
+use Laravel\Socialite\Two\User as ProviderUser;
+
+class SocialUserResolver implements SocialUserResolverInterface
+{
+    /**
+     * Resolve user by provider credentials.
+     *
+     * @param string $provider
+     * @param string $accessToken
+     *
+     * @return Authenticatable|null
+     */
+    public function resolveUserByProviderCredentials(string $provider, string $accessToken): ?Authenticatable
+    {
+        $providerUser = null;
+
+        try {
+            $providerUser = Socialite::driver($provider)->scopes(['profile email public_metadata'])->userFromToken($accessToken);
+        } catch (Exception $exception) {}
+
+        if ($providerUser) {
+            return (new SocialAccountsService())->findOrCreate($providerUser, $provider);
+        }
+        return null;
+    }
+}